To set up a SKU system for clothing, build each SKU from three parts, category, source, and date, plus a short sequence number, then store every item in a labeled bin whose location is logged against that SKU. Done right, a sold item takes under a minute to find and pull.
Here is the failure we are fixing. You sell a flannel on Tuesday. The order says "Men's L plaid shirt." You have 14 of those. You open three bags, check four hangers, and 11 minutes later you find it, or you don't, and you cancel the order. A cancelled order costs you a defect mark and a sale. At 30 sales a week, even 5 minutes of hunting per sale is 2.5 hours gone.
What a Good Clothing SKU Encodes
A SKU is not a description. The title and item specifics already hold brand, size, and color. A SKU is a key that points to one physical item. Keep it short enough to write on a tag in four seconds and read aloud without confusion.
We encode three things, because these are the ones you will actually filter by later:
- Category: tells you where to look and which sourcing rules paid off.
- Source: tells you which store, bale, or sale the item came from, which feeds cost basis and sourcing ROI.
- Date: tells you how long it has been sitting, which drives your relist and markdown schedule.
Skip brand, size, and color in the SKU. They change when you correct a listing, and a SKU should never need to change.
A SKU Format for Resale Clothing You Can Copy
Use this pattern: CAT-SRC-YYMMDD-SEQ.
| Part | Example | Meaning |
|---|---|---|
| CAT | DN | Denim |
| SRC | G3 | Goodwill location 3 |
| YYMMDD | 261014 | Sourced Oct 14, 2026 |
| SEQ | 07 | Seventh item from that trip |
That gives you DN-G3-261014-07. It is 15 characters, sortable by category, and the date sorts chronologically in any spreadsheet.
Pick two-letter category codes and stick to a fixed list. A starter set: DN denim, KN knits, TS tees, OW outerwear, DR dresses, SU suits and tailoring, LE leather, AW activewear, SH shoes. If a category has fewer than 10 items a month, fold it into a catch-all code like MX until it earns its own.
Source codes work the same way. One letter for the type (G for Goodwill, S for Salvation Army, E for estate sale, B for bale) plus a number for the location. Keep the key in one reference sheet.
Why the Bin Location Matters as Much as the SKU
A SKU tells you which item. A bin location tells you where it is. You need both, and they are two separate fields. If you make the location part of the SKU, you have to relabel the item every time you move it.
Build locations from zone, shelf, bin: for example B-3-04 is zone B, shelf 3, bin 04. Rules that keep it findable:
- Store by category first, then by SKU date inside the bin, oldest at the front. Aged stock gets seen.
- Cap each bin at a number you can scan at a glance, usually 15 to 25 folded items or 10 to 12 hung items.
- Hang outerwear, suits, and anything wrinkle-prone. Fold knits to avoid shoulder bumps from hangers.
- Never create a "misc" bin. It becomes the place items vanish.
[Screenshot placeholder: FlipDesk inventory view showing SKU, bin location, and days in stock columns]
7 Steps to Set Up Your System
- List your categories and cap them at about 10. Count what you listed in the last 90 days and give each major category a two-letter code.
- Assign source codes. Give every store, estate sale, and bale supplier a code and record it in one reference sheet.
- Lock the SKU format. Use CAT-SRC-YYMMDD-SEQ and write one example on a card taped above your workstation.
- Map your storage. Walk the space, name each zone with a letter, number each shelf, and number each bin. Put a printed label on the shelf edge.
- Tag at intake, not at listing. Assign the SKU when the item comes through the door, then log the cost basis against it. Items without SKUs are the ones you lose.
- Record the bin at the moment of shelving. Scan or type the bin code against the SKU before you walk away. A location you plan to log later is a location you won't have.
- Run the one-minute pull test. Pick five random sold SKUs and time how long each takes to find. Anything over 60 seconds means a bin is overfull, a label is unreadable, or a location was never logged. Fix that cause, then test again.
Label Printing for Clothing SKUs
Handwriting works until about 100 items. After that, print. A thermal label printer with 2x1 inch labels is the common choice for resellers, and one roll covers hundreds of items.
What goes on the label matters more than the printer:
- The SKU in large, plain type, plus a barcode or QR code if you scan.
- A short size and category line so you can sanity check at a glance.
- Nothing else. Price on a label gets stale the moment you reprice.
Attach labels to a hang tag or a small poly bag, not directly to fabric. Adhesive on delicate knits or leather can leave residue and hurt Fabric Condition. For folded items, a swing tag through the care label loop keeps the SKU visible without touching the garment face.
Tie the SKU to Condition So Returns Stay Traceable
A SKU is also where you attach what you know about condition. Log the grade and the notes against it at intake: NWT, NWOT, Excellent, Very Good, Good, Fair, or Poor, plus any flag against the five factors, Fabric Condition, Structural Integrity, Cosmetic Appearance, Functional Elements, and Odor & Cleanliness.
That record pays off when a buyer opens a not-as-described case. You can pull the SKU, see the grade, and compare it to what the buyer says. Over time you can also slice returns by category and source, which shows you if one store's stock is consistently graded too generously.
The Math: What a System Saves
Take a seller doing 120 sales a month. Without a system, say each pull averages 6 minutes including the occasional dead search. That is 12 hours a month. With a working bin system averaging 1 minute, it is 2 hours. You get back 10 hours. At even $15 an hour of your own time, that is $150 a month, before counting cancelled orders you no longer eat.
These numbers are an example. Time your own pulls for a week to get your real baseline.
Common Mistakes
- Putting size or brand in the SKU. It breaks the moment you fix a listing.
- Reusing SKUs. Once sold, retire the SKU. Reuse corrupts your history.
- Logging the bin in your head. If it is not in the record, it does not exist.
- Overfilling bins. A bin you cannot scan in 10 seconds is too full.
Try It on One Haul
You don't need to relabel your whole stockroom. Take your next haul, assign SKUs at intake, shelve by bin, and run the one-minute pull test on the first five sales. FlipDesk keeps the SKU, bin location, cost basis, and grade in one record, so you can see if the system holds up before you commit more inventory to it.