Short answer: reorder when your projected sales during the total replenishment lead time will consume your remaining stock — that means placing the order while you still have inventory, not when the shelf is empty. The formula is simple: reorder point = average daily sales × total lead time in days + safety stock. The discipline is everything around the formula: knowing your real lead time, your real velocity, and your manufacturer's real schedule.
We sit on the other end of this decision every week. The reorder that arrives with four weeks of stock left is a routine production slot. The reorder that arrives with the product already sold out is a rescue operation — and rescue operations are where brands pay for air freight, miss their own restock announcements, and teach customers to buy from someone else.
1. Why waiting until products sell out is a mistake
Sold-out feels like success. Financially, it's a leak. Every day a proven product is unavailable, three things happen: you lose the sales you would have made, you spend marketing money sending traffic to a product page that can't convert, and a slice of your customers buys the alternative and doesn't come back.
Stockouts are also far more common — and more self-inflicted — than brands assume. The classic retail research (Gruen & Corsten's multi-country stockout studies) found that 70–90% of stockouts trace back to internal ordering and replenishment processes, not supplier failures. More recently, IHL Group estimated that inventory distortion — stockouts plus overstocks — cost retailers $1.73 trillion globally in 2025. The dominant cause isn't that factories fail; it's that brands reorder late.
Lululemon gave this a public face in 2024, when it attributed slowing US growth partly to stockouts in core small sizes — demand existed, inventory positioning didn't. If that happens to a company with Lululemon's planning machinery, a brand running on spreadsheets and gut feel needs a trigger that doesn't depend on remembering to check.
2. What a reorder point actually is
The reorder point (ROP) is the inventory level at which placing a new order keeps you in stock through the replenishment wait. It's not a guess and it's not a vibe — it's a calculation:
Reorder Point = Average Daily Sales × Total Lead Time (days) + Safety Stock
Worked example with explicit assumptions: your heavyweight hoodie sells 3 units/day on average. Your total replenishment lead time — production plus quality check plus international shipping plus receiving — is 45 days. You hold 30 units of safety stock (about ten days of demand) for demand spikes and delays. Your reorder point is 3 × 45 + 30 = 165 units. When available stock hits 165, the purchase order goes out — not when it hits 30, not when it hits zero.
Change any assumption and the number moves. Slower shipping (sea instead of air) extends lead time and raises the ROP. A faster manufacturer lowers it. Higher safety stock raises it. That's the point of the formula: it turns a stressful judgment call into arithmetic you can argue with.
3. Calculate yours with honest inputs
The formula fails when the inputs are flattered. Three places brands lie to themselves:
- Sales velocity. Use a trailing window that matches the product's life stage — the launch spike is not your run rate. For a product past its launch month, the trailing 4–8 weeks of daily average is honest; the launch week is not.
- Lead time. Not "production time" — total time from decision to sellable stock. Include order confirmation, fabric allocation, production, inspection, booking, transit, customs, and warehouse receiving. Brands routinely calculate with 30 days and live with 50.
- Stock level. Use available-to-sell inventory, not units that exist somewhere in transit, on hold, or already allocated to open orders.
And compute the ROP per SKU, not per style. If your black hoodie in L sells 2/day and the olive in XS sells 0.1/day, they need different reorder triggers — or one of them needs to not be reordered at all.
4. Know your real manufacturing and shipping lead times
Lead time is the input you have the least control over and the most obligation to measure. For overseas cut-and-sew production, the realistic stack looks like this:
- Order confirmation and materials — a few days to two weeks, depending on whether fabric is in stock or dyed to order.
- Production — our repeat orders run 20–35 days for bulk streetwear. Repeat orders are faster than first runs because patterns, specs, and approved samples already exist — this is one of the structural advantages of reordering proven products instead of constantly developing new ones.
- QC and packing — days, not weeks, if your manufacturer has a real inspection process (we run AQL 2.5 checks before anything ships).
- Freight — the swing variable. Air is days and expensive; sea is weeks and cheap. A 20–35 day production run paired with 30–40 days of sea freight is a very different ROP than the same production paired with air.
- Receiving — the days your 3PL or garage needs to check goods in before they can sell.
Add it up honestly once, write it down, and re-measure it every order. The brands with chronic stockouts are usually running their ROP math on a lead time that stopped being true two shipments ago.
5. How much safety stock should you keep?
Safety stock is your insurance against the two things that always eventually happen: demand spikes and supply delays. More insurance costs more premium — in this case, cash tied up in units sitting still.
A practical way to size it without statistics software: take the larger of your demand variability and your lead-time variability. If your weekly sales swing ±30% and your supplier's delivery has been within a week of promise every time, demand is your risk — hold extra days of demand. If your sales are steady but your last three shipments arrived at 30, 41, and 55 days, lead time is your risk — hold extra days of supply. For most small brands, one to two weeks of average demand is a sane starting safety stock for proven sellers, reviewed quarterly.
What you should not do is apply the same buffer to everything. Your bestseller's stockout costs you real money; a slow SKU's stockout costs you nothing. Concentrate safety stock where velocity and margin make availability valuable.
6. Small frequent reorders vs. bulk orders
The unit-cost math pulls you toward bulk; the cash-flow and risk math pulls you toward smaller, more frequent orders. The right answer depends on certainty:
- Proven seller, stable velocity, healthy cash: bulk makes sense. Larger runs lower per-unit cost and reduce the number of lead-time exposures per year.
- Growing but volatile seller: smaller, more frequent reorders keep you honest. You pay slightly more per unit and buy protection against a demand shift with every order.
- Anything unproven: minimum viable quantities, always. The MOQ floor for custom streetwear (50 pieces per style with us) exists so that "small" stays genuinely small.
One number worth remembering when bulk tempts you: BoF–McKinsey estimated the industry made 2.5–5 billion excess garments in 2023. Nobody overproduced on purpose. They bought depth at good unit prices against demand that didn't materialize. Unit cost is visible on the quote; overstock cost is invisible until it's yours.
7. Coordinate replenishment with your manufacturer like a partner
The reorder point tells you when to trigger. Your manufacturer determines whether the trigger works. A few practices separate smooth replenishment from constant emergencies:
- Share forecasts early. Tell your factory what you expect to reorder and roughly when, even before you're certain. Fabric allocation and line scheduling are easier with warning than without.
- Ask about material position. For repeat orders, whether your fabric is in stock or needs a fresh dye lot changes the lead time by weeks. Good factories track this; the answer should take one message, not one week.
- Confirm the schedule before announcing the restock. Get the production slot and ship date confirmed, then tell your customers. Announcing a restock date based on hope is how brands end up apologizing.
- Keep specs frozen between reorders. Every "small change" on a repeat order quietly converts it back into a development project with sampling rounds. Freeze the spec; change it deliberately in a new version, not accidentally in a reorder.
This is genuinely easier with a manufacturer built for repeats. Our repeat orders skip development entirely and run 20–35 days production because the patterns, samples, and fabric specs already exist — and when a brand shares a sell-through calendar with us, we can hold fabric position for the reorder before the PO arrives. Whatever factory you use, treat lead time as a shared number, not a surprise.
"A stockout is rarely a sales problem. It's a calendar problem that started six weeks earlier, when someone decided there was still time."
Frequently asked questions
What is the reorder point formula for a clothing brand?
Reorder Point = Average Daily Sales × Total Lead Time in Days + Safety Stock. Example with stated assumptions: 3 units/day average, 45 days total lead time (production + shipping + receiving), 30 units safety stock → ROP = 3 × 45 + 30 = 165 units. Place the order when available stock hits that number.
How long does clothing manufacturing take for a reorder?
Repeat orders are the fastest production that exists because development is already done — patterns, approved samples, and fabric specs carry over. Our repeat bulk orders run 20–35 days production, plus freight (days by air, weeks by sea) and receiving. First-time products take longer because sampling comes first.
How much safety stock should a small clothing brand hold?
Start with one to two weeks of average demand on proven sellers, then adjust: increase it if your sales are volatile or your supplier's delivery dates slip, decrease it for stable products with reliable lead times. Don't hold meaningful safety stock on slow SKUs — their stockout costs you almost nothing.
Should I reorder before or after a product sells out?
Before — always before. If the product sells out and then you order, you endure the entire production-plus-shipping window with zero stock and zero sales. The reorder trigger should fire while weeks of stock remain, which is exactly what the reorder point calculation gives you.
Is it cheaper to do one big bulk order or several small reorders?
Bulk wins on unit cost; small frequent orders win on cash flow and risk. For proven sellers with stable demand and healthy reserves, bulk is rational. For anything volatile or unproven, smaller reorders cap the damage of being wrong — and the industry's billions of excess garments each year are evidence of what bulk-against-hope produces.
Conclusion
Replenishment is the least glamorous discipline in a clothing brand and the one that protects the most revenue. Know your velocity, know your real end-to-end lead time, keep a deliberately sized buffer, and let the reorder point — not the empty shelf — tell you when to act.
If you're planning a restock and want a production slot, a confirmed timeline, and a straight answer on fabric availability before you announce dates to your customers — send us the style and we'll map it with you.