Most clothing brands don’t fail because of bad design. They fail because they run out of their best-selling hoodie in the middle of their biggest campaign, or because they’re sitting on 400 units of a style nobody wants, slowly eating into their cash flow.
Stock management is one of the most important parts of running a clothing brand business model. Get it right and you’ll have cash available when you need it, customers who can actually buy what they want, and a business that doesn’t constantly feel on the verge of a supply crisis. This guide covers everything from the fundamentals to the system you need to actually make it work.
Who this guide is for
This guide is for clothing brand founders who are managing physical inventory, whether you’re just transitioning from print on demand or pre-order into full stock, or you’ve been holding inventory for a while but things feel chaotic.
You’ll get the most value if:
- You’re holding or planning to hold 100+ units of physical stock
- You’ve had at least one experience of stocking out or being stuck with unsold inventory
- You’re ready to stop managing inventory by gut feeling and start using data
- You want a repeatable system, not just a spreadsheet tip
If you haven’t validated demand yet, go back to print on demand or pre-order first. Stock management is only useful once you know what sells.
Why stock management matters more in fashion than almost any other industry
Fashion has some of the worst inventory dynamics of any retail category. Trends shift fast, seasons are hard deadlines, and customers have low tolerance for waiting. A style that’s hot in October is often dead by January.
Poor stock management creates a cascade of problems: you discount to clear dead stock, which trains customers to wait for sales, which erodes your brand positioning, which forces you to discount more. Breaking that cycle starts with the fundamentals.
- Around 30% of fashion inventory ends up sold at a discount or written off entirely.
- 72% of customers won’t wait for a restocked item and will go to a competitor instead.
- Brands with excess stock typically tie up 2 to 4 times more capital than lean inventory brands.
The core tension: you need enough stock to not miss sales. But too much stock ties up cash, takes up space, and forces markdowns. Everything in inventory management is about finding the optimal middle.
The main stock management methods
Before building your system, it helps to understand the different approaches. The right one depends on your brand’s stage, production model, and risk tolerance.
FIFO (First In, First Out)
The items you received first are the first you sell or ship. This is the standard approach for most clothing brands, and for good reason: it prevents older stock from sitting at the back while newer product rotates. Particularly useful for seasonal basics where quality or colour consistency can vary slightly between production runs.
Just-In-Time (JIT)
You order stock only when you need it, minimising what you hold at any given time. Attractive in theory because it keeps cash free and eliminates dead stock, but extremely challenging for clothing brands because lead times from manufacturers are long and unpredictable. Works best when you have a reliable fast-turnaround supplier, or when you’re running a pre-order model.
ABC analysis
You segment your SKUs into three categories based on their contribution to revenue:
- A items are your top roughly 20% of SKUs, generating around 70 to 80% of revenue. Manage these closely, prioritise reorders, and never let them go out of stock.
- B items are mid-range performers. Monitor monthly and reorder when needed.
- C items are the long tail with low contribution. Consider whether to continue carrying them at all.
Most clothing brands focus too little on A items. If your black oversized tee is responsible for 40% of your revenue, it deserves a dedicated reorder schedule and a safety buffer you never dip below, not the same attention as a limited colourway that sells 3 units a month.
Drop-based inventory
You produce a fixed run, sell through it, and don’t restock. This eliminates deadstock entirely but requires you to estimate demand accurately upfront. Corteiz built their entire brand identity around this model, using limited drops to create scarcity and hype.
Step-by-step: how to build your stock management system
This framework walks you through every decision from setting up your system to managing ongoing restocks. Follow the steps in order and don’t skip ahead.
Step 1: Audit what you actually have
You can’t manage what you haven’t counted. Before anything else, do a full physical count of every SKU you hold, broken down by colour and size.
For each SKU, record:
- Product name and variant (colour, size)
- Units on hand
- Units sold in the last 30, 60, and 90 days
- Date stock was received
This gives you your baseline. Everything else in the system is built on top of this data. If your Shopify inventory counts are wrong, fix them now before you move on.
Step 2: Set up your SKU structure
Every product variant needs a unique, consistent SKU code that makes it immediately clear what the product is. A good format encodes the style, colour, and size in a predictable pattern.
Example format: TEE-BLK-M (tee, black, medium) or HOOD-NVY-L (hoodie, navy, large)
Consistent SKUs prevent fulfilment errors, make inventory counts faster, and become essential once you’re managing hundreds of variants across multiple products. Set this up once and stick to it. Changing your SKU structure later is a nightmare.
Step 3: Classify your SKUs with ABC analysis
Once you have your audit data, run ABC analysis to figure out which products deserve the most attention.
How to do it:
- List all SKUs with their total revenue contribution over the last 6 to 12 months
- Sort from highest to lowest revenue
- Label the top 20% as A items, the next 30% as B items, and the remaining 50% as C items
Example for a brand with 10 SKUs:
- Black tee M and L: €3,200 revenue combined (A items)
- Black tee S and XL, white tee M and L: €2,100 combined (B items)
- Remaining colour/size variants: €800 combined (C items)
From this point forward, your A items get a dedicated reorder schedule, a safety stock buffer, and weekly monitoring. Your B items get monthly reviews. Your C items get evaluated every quarter: do they stay, get discounted, or get cut?
Step 4: Calculate your key metrics
You don’t need a spreadsheet with 40 columns. You need to deeply understand four numbers.
Sell-through rate
Formula: Sell-Through Rate = (Units Sold / Units Received) x 100
Measure over a fixed period, typically per season or per month. Aim for 80% or higher on core SKUs.
Example: You received 200 black tees. After 60 days you’ve sold 140. Sell-through rate = (140 / 200) x 100 = 70%. That’s a healthy pace. If you’d only sold 50 after 60 days (25%), you need to act before the season ends.
Inventory turnover
Formula: Inventory Turnover = Cost of Goods Sold / Average Inventory Value
A higher number means stock is moving fast. Fashion brands typically aim for 4 to 6 times per year, though this varies by segment. A brand like Lululemon turns inventory much faster than a luxury brand because of its high repeat purchase rate and broad product range.
Example: Your COGS last year was €24,000 and your average inventory value was €6,000. Turnover = 24,000 / 6,000 = 4x. That means you’re cycling through your full inventory roughly every 3 months. Healthy for a growing brand.
Days Sales of Inventory (DSI)
Formula: DSI = (Average Inventory / COGS) x 365
How many days it takes to sell through your current inventory. Aim for under 60 days in season. If your DSI is creeping above 90, you have a problem that needs addressing before it becomes a cash flow crisis.
Reorder point
Formula: Reorder Point = (Average Daily Sales x Lead Time in Days) + Safety Stock
This is the most practically important formula in this guide. When your stock hits this number, you trigger a reorder immediately.
Example: You sell 2 black tees per day on average. Your manufacturer’s lead time is 35 days. You want a safety stock buffer of 20 units.
Reorder point = (2 x 35) + 20 = 90 units
When your black tee stock hits 90 units, you place a reorder that day. No guessing, no waiting until you’re almost out.
Step 5: Set your safety stock
Safety stock is a buffer that exists specifically for unpredictable demand spikes and supplier delays. Most small brands don’t have formal safety stock. They wing it. Then they have a PR moment, someone with an audience posts about their product, and they’re out of stock within hours.
How to calculate it:
A simple starting point: safety stock = average daily sales x your supplier’s average delay in days.
Example: You sell 2 tees per day. Your supplier is usually on time but has been 10 days late twice in the past year. Safety stock = 2 x 10 = 20 units.
For A items, add an additional spike buffer of 10 to 20 extra units on top of this if your brand runs regular influencer campaigns or drops that cause sudden demand increases.
Safety stock has a cost because it’s capital sitting on a shelf. The goal is not to maximise it, but to right-size it based on your actual demand variability and supplier reliability.
Step 6: Build your reorder system
A reorder system means you never place orders reactively. You have rules that tell you exactly when to reorder, how much to order, and how to adjust based on what’s actually selling.
Reorder trigger: Place a reorder when stock hits the reorder point you calculated in Step 4. For most brands starting out, this is around 30 to 40% of your original order quantity remaining.
How many units to reorder: Base your reorder quantity on 3 to 4 months of sales at your current pace, adjusted for any known changes (upcoming campaign, seasonal shift, new channel).
Example:
- Current sales pace: 60 black tees per month
- You’re launching an email campaign next month that historically increases sales by 30%
- Adjusted forecast: 78 tees per month
- Reorder for 4 months: 78 x 4 = 312 units, rounded up to manufacturer MOQ of 350
Reorder workflow:
- Check inventory levels every week (Monday morning, block 30 minutes)
- Identify any SKUs that have hit or are approaching their reorder point
- Review sales data: is demand still strong, accelerating, or declining?
- Adjust reorder quantity based on current data, not last order’s quantity
- Place reorder and confirm production timeline with manufacturer
- Log expected arrival date in your system
Don’t wait until you’re sold out. Manufacturing and shipping take 4 to 8 weeks. If you wait until zero stock, you lose momentum, miss sales, and often end up paying extra for expedited production.
Step 7: Adjust size and colour mix with every reorder
Your first order was an educated guess. Every reorder after that should be data-driven. This is where most brands leave money on the table: they keep ordering the same size and colour split even when the data is telling them something different.
Size distribution: If you don’t have your own data yet, the standard starting point is S: 10-15%, M: 35-40%, L: 35-40%, XL: 10-15%. But use your own numbers as soon as you have them. If Medium consistently sells out first and XL has 40% left after 90 days, your next order should reflect that.
Example adjustment:
- Order 1 (150 units): S 20 / M 60 / L 55 / XL 15
- Sell-through after 90 days: S 85% / M 98% / L 80% / XL 45%
- Order 2 (150 units adjusted): S 15 / M 75 / L 50 / XL 10
Colour distribution: Apply the same logic. If black outsold white 3:1 in your last order, your next reorder should be weighted accordingly, not split 50/50 out of habit.
Repeat this process every reorder. By order 3 or 4, you’ll have very accurate data and minimal dead stock from poor size or colour forecasting.
Step 8: Create your dead stock protocol
Every brand ends up with some stock that doesn’t sell at the pace expected. The mistake is letting it sit indefinitely, hoping it will move. You need a rule decided in advance, before you’re emotionally attached to the product.
A simple tiered protocol:
- 60 to 90 days, under 40% sold: 15% off promotion, bundle with a bestseller, or increase ad spend on that product
- 90 to 120 days, under 30% sold: 25% off, offer to your email list with an exclusive code, or bundle as a free gift with purchase
- 120+ days, under 20% sold: 40 to 50% off to clear space, donate to charity for a tax write-off and PR, or use as branded merchandise for events and collaborations
If sustainability is part of your brand, dead stock can also feed into a sustainable clothing strategy through upcycling or charity partnerships. This turns a financial problem into a brand story.
Write this protocol down and treat it as policy. Don’t make it an emotional decision every time a product underperforms.
Step 9: Plan inventory around seasons
Inventory needs change with seasons. Don’t order hoodies and sweaters in June or tank tops and shorts in December unless you’re targeting the opposite hemisphere.
Seasonal inventory calendar:
- Spring (March-May): Lightweight tees, tank tops, light jackets. Order in January for March arrival.
- Summer (June-August): Tank tops, shorts, breathable fabrics. Order in April for June arrival.
- Fall (September-November): Long-sleeve tees, light hoodies, jeans. Order in July for September arrival.
- Winter (December-February): Hoodies, sweaters, heavy outerwear. Order in October for December arrival.
Plan 2 to 3 months ahead. If you wait until the season starts to order, you’ll miss peak sales while waiting for production. And clear out seasonal items with discounts before the season ends. Don’t hold winter hoodies through summer.
For a deeper look at building seasonal ranges, see our guide on seasonal collections.
Step 10: Choose the right tools
The right tool depends on where you are as a brand. The best tool is the one you’ll actually use consistently. A comprehensive system you check once a month is worth less than a simple spreadsheet you review every week.
- Just starting out (under 200 SKUs): A well-structured Google Sheet is enough. Free, flexible, and it forces you to understand your numbers.
- Growing on Shopify: Stocky or Inventory Planner integrate directly with your store data and automate reorder alerts and sell-through tracking.
- Scaling with wholesale: Cin7 or Linnworks handle multi-channel orders, wholesale, and 3PL integrations. Overkill early on but essential at scale.
- Selling wholesale alongside DTC: Faire has built-in inventory syncing with many platforms.
Start with Shopify’s built-in inventory tracking. Upgrade to paid software when you’re managing 5 or more products across multiple channels and need proper forecasting.
Working with manufacturers to improve inventory control
Your stock management doesn’t start when goods arrive at your door. It starts with your supplier relationship. Brands with better supplier relationships have more flexibility, shorter lead times, and fewer surprises.
- Track actual lead times, not promised ones. If your manufacturer promises 5 weeks but consistently takes 7, your reorder point calculation needs to use 7. Build your system around reality, not optimism.
- Negotiate partial shipments. Some manufacturers will ship in smaller batches, which lets you hold less inventory at any given time while still maintaining availability.
- Ask about fabric reservation. If you have a core fabric or colour that runs across multiple styles, some manufacturers will hold fabric inventory for you. This lets you reorder finished goods much faster without committing to a full production run upfront.
- Push for MOQ flexibility over time. Minimum order quantities often become more negotiable as your relationship grows and your volumes increase. Start negotiating this after your second or third order.
Demand forecasting: the next level
Once your basic system is in place, demand forecasting is what separates brands that are always scrambling from brands that always seem to have exactly what they need.
At its simplest, forecasting means looking at past sales patterns and projecting them forward, adjusted for anything you know is different this time, such as a bigger marketing budget, a new channel, or a seasonal shift. You don’t need a machine learning model. A 3-month rolling average with seasonality adjustments will get you 80% of the way there.
More sophisticated brands factor in website traffic trends, email marketing open rates, and planned marketing spend. If you know an influencer campaign typically triples your conversion rate, you should increase your safety stock for that period accordingly.
The fastest way to improve your forecasting: track your forecast versus actual for every buy. After each season or launch, write down what you predicted and what actually happened. Within a year, you’ll have dramatically better intuition about where you consistently over or under-estimate.
The five most common stock management mistakes
Buying by feel, not data
You loved the forest green colourway. Your manufacturer said it was trending. Your friend said she’d definitely buy it. None of that is data. Base your buy decisions on historical sell-through rates by category, colour, and size, and start building that dataset from day one.
Ignoring size distribution
Ordering equal quantities across all sizes is almost always wrong. Your customers don’t buy evenly across sizes. Analyse your size run and reorder accordingly. Running out of size M while size XS sits in your warehouse is a completely preventable problem.
No safety stock calculation
Most small brands wing it. Then they have a PR moment or a post goes viral, and they’re out of stock within hours. Safety stock exists specifically for unpredictable spikes. The cost of holding it is almost always lower than the cost of stocking out at a peak moment.
Treating all stock the same
Your black core tee and your seasonal limited drop are completely different inventory management problems. One needs a robust reorder system and a permanent safety buffer. The other is a one-time run that should be fully cleared before it’s replaced. Mixing the two approaches leads to bad decisions across the board.
No dead stock protocol
Every brand ends up with some stock that doesn’t sell. The mistake is letting it sit indefinitely. Define the discount tiers and timelines in advance, as described in Step 8, and follow through automatically. The sooner you act on slow-moving stock, the more cash you recover to reinvest in products that actually sell.
The bottom line
Stock management isn’t glamorous. It won’t show up in your brand photoshoot or your social media strategy. But the brands that build it into their operations early are the ones that have cash to invest in growth instead of constantly firefighting supply crises.
Start with the basics. Audit your stock, classify your SKUs, set reorder points, and review weekly. That alone will put you ahead of most brands at your stage. And once your stock management is solid, after-sales marketing and loyalty programs become much more powerful, because you’ll actually have the inventory to back up your promises to customers.
Frequently asked questions about stock management
Stock management is the process of tracking how much inventory you have, knowing when to reorder, and making sure you never run out of your best-selling products or get stuck with too much of what isn’t selling. For clothing brands specifically, it involves managing SKUs across multiple sizes and colours, calculating reorder points, and building a system for slow-moving or dead stock.
Use this formula: Reorder Point = (Average Daily Sales x Lead Time in Days) + Safety Stock. For example, if you sell 2 units per day, your manufacturer takes 35 days, and you want a safety buffer of 20 units, your reorder point is (2 x 35) + 20 = 90 units. When stock hits 90, you place your order that day.
Aim for 80% or higher on core SKUs within a season. A sell-through rate of 50 to 70% within 60 to 90 days is a healthy pace for most clothing brands. If you’re under 30% after 60 to 90 days, you need to act early with discounts or bundles before the season ends and the product loses value.
ABC analysis is a method of categorising your products by revenue contribution. A items are your top 20% of SKUs that generate roughly 70 to 80% of revenue. B items are mid-range performers. C items are low-contribution products. The idea is to focus your time and safety stock budget on A items and review whether C items are worth continuing to carry.
A simple starting point is: safety stock = average daily sales x your supplier’s average delay in days. If you sell 2 units per day and your supplier is sometimes 10 days late, hold 20 units as a buffer. For A items where demand can spike unpredictably, add an extra 10 to 20 units on top of that, especially if you run regular influencer campaigns or drops.
Early stage brands can manage well with a structured Google Sheet. Growing brands on Shopify often use Stocky or Inventory Planner, which integrate with your store and automate reorder alerts. Brands scaling with wholesale typically move to Cin7 or Linnworks for multi-channel management. The best tool is the one you actually review consistently every week.
Act on it early rather than letting it sit. At 60 to 90 days with under 40% sold, run a 15% off promotion or bundle it with a bestseller. At 90 to 120 days with under 30% sold, go to 25% off and email your list. At 120+ days with under 20% sold, discount 40 to 50% to clear space, donate to charity for a tax write-off, or use as free gifts with purchase. Define these rules in advance so it’s policy, not an emotional decision every time.
Use your own sales data from previous orders, print on demand, or pre-order campaigns. If you have no data yet, the standard starting distribution is S: 10-15%, M: 35-40%, L: 35-40%, XL: 10-15%. After your first inventory cycle, adjust based on which sizes sold fastest. If Medium consistently sells out first, increase its percentage in your next reorder and decrease sizes that always have leftovers.
