Inventory management for Shopify underwear brands

The inventory problems underwear brands run into

• Size curve imbalance. Most brands sell a bell curve of sizes (S, M, L sell more than XS, XXL), but new styles often get stocked evenly across sizes, leaving mid-sizes out of stock while small and large sizes sit on shelves.
• Huge SKU count per style. One style in 5 colors and 6 sizes is 30 variants, and each needs its own reorder point, which makes manual spreadsheets slow to maintain and easy to get wrong.
• Fabric and dye lot variation. Reorders from overseas mills can come in a slightly different shade or stretch, so brands often want to track supplier batches even though that is not core inventory math.
• Mix of basics and seasonal drops. Core styles (basic briefs, bras) need steady replenishment, while limited drops or collabs are one-time buys with no reorder, and treating them the same way wastes cash on dead stock.
• Returns and exchanges for fit. Underwear has high size-exchange rates for fit reasons, which pulls stock between sizes in ways that do not show up cleanly in simple sales forecasts.

Seasonality and demand

Underwear has real but mild seasonality compared to apparel overall. Valentine's Day drives a spike in matching sets and lingerie gifting, Black Friday and Cyber Monday drive multi-pack basics sales, and back-to-school lifts kids' and teen lines. Loungewear and seamless styles often see a bump in January with New Year wellness buying. Core basics (cotton briefs, everyday bras) sell fairly steadily year-round, so plan safety stock higher only around known promo dates and gifting holidays, not across the whole calendar. Build your order-by dates backward from Valentine's and Black Friday specifically, since overseas lead times mean you often need to place those orders months ahead.

Suppliers, lead times and minimums

Most underwear brands source from overseas garment manufacturers (often Asia or Central America) for owned-label production, or from domestic distributors for stocking established brands. Overseas cut-and-sew suppliers often take several weeks to a few months per order, especially with custom fabric or trims, and may require minimums per color or per style (sometimes a minimum per size curve, not just per unit). Domestic or branded distributors usually have shorter lead times and lower case-pack minimums, often sold in pre-set size-curve packs (for example, a pack covering S-XL in fixed ratios) rather than letting you pick quantities freely per size.

Worked example

Say your best-selling brief style in size M sells 4 units a day on average. Your overseas supplier has a lead time of 30 days, and you keep 7 safety days for shipping delays. Reorder point = 4 x (30 + 7) = 148 units. For order quantity, say you want 45 days of cover, you currently hold 90 units, and you have 60 more on order. Order qty = 4 x (30 + 45) - (90 + 60) = 300 - 150 = 150 units, which your supplier sells in case packs of 24, so you'd round up to 168.

Try it with your own numbers in the reorder point calculator, or size your buffer with the safety stock calculator.

A simple system to start this week

1. List every active style, color, and size as its own variant with its own lead time and case pack size.
2. Set higher safety days for your best-selling core sizes (usually S-L) than for tail sizes.
3. Mark seasonal drops and collabs as non-reorder items so they do not clutter your weekly reorder list.
4. Build in order-by dates working backward from Valentine's Day and Black Friday given your supplier's typical lead time.
5. Track fabric or dye lot numbers yourself outside the app if shade matching across reorders matters to your brand.
6. Review the weekly reorder email and adjust quantities for any known upcoming promo before approving purchase orders.

How SteadyShelf fits underwear brands

SteadyShelf forecasts demand and sets reorder points per variant, so it handles the size-and-color SKU sprawl that makes underwear inventory hard to manage by hand, and it rounds orders to your supplier's case packs automatically. It does not track dye lots, fabric batches, or expiry, so if shade consistency across reorders matters to your brand, keep that log separately outside the app. It also does not handle bundles, so multi-packs or gift sets need to be set up and tracked as their own listings.

$29/month flat, unlimited products and suppliers, 30-day free trial.

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