AQL Inspection for Apparel: How to Set Your Quality Standard
The short answer
AQL (Acceptable Quality Limit) is a sampling standard, not a promise of perfection. For workwear the industry default is AQL 2.5 for major defects and 4.0 for minor defects, and premium or certified programmes use 1.5. On a 1,000-piece order you inspect 80 pieces: 5 or fewer major defects passes the lot, and 6 fails it.
The number that protects your money is not the AQL figure, it is the defect definition. If the checklist does not say exactly what a major defect is, two inspectors will give you two different results on the same carton.
Last updated: September 2026. Based on ISO 2859-1.
Key takeaways
- AQL 2.5 / 4.0 is the garment default. AQL 1.5 costs more and suits premium or protective programmes.
- Critical defects are never acceptable, whatever the AQL level says.
- Final inspection catches workmanship, not process failures. Use in-line inspection for that.
- Sample size changes with lot size, not with how much you paid.
- A photographed, signed report is the deliverable. If the inspection leaves no record, it did not happen.
1. What AQL actually means
AQL defines how many defective pieces you accept in a sample before the whole lot is rejected. It does not mean "2.5% of the order may be defective", and it does not guarantee that the uninspected pieces are good.
| Term | Meaning |
|---|---|
| Lot | The quantity offered for inspection, for example 1,000 pieces |
| Sample size | The number of pieces inspected, set by lot size |
| Accept (Ac) | The maximum number of defects that passes the lot |
| Reject (Re) | The number of defects that fails the lot |
| Major defect | Affects function, sale or safety, for example a broken zip, a hole or a wrong measurement |
| Minor defect | Affects appearance but not function, for example uneven stitching or a loose thread |
| Critical defect | Unsafe or illegal, for example needle fragments, a missing certification marking or uncertified tape |
2. Sampling table for garment orders
ISO 2859-1, general inspection level II, normal severity.
| Lot size (pieces) | Sample size | AQL 1.5 (Ac/Re) | AQL 2.5 (Ac/Re) | AQL 4.0 (Ac/Re) |
|---|---|---|---|---|
| 91–150 | 20 | 1 / 2 | 1 / 2 | 2 / 3 |
| 151–280 | 32 | 1 / 2 | 2 / 3 | 3 / 4 |
| 281–500 | 50 | 2 / 3 | 3 / 4 | 5 / 6 |
| 501–1,200 | 80 | 3 / 4 | 5 / 6 | 7 / 8 |
| 1,201–3,200 | 125 | 5 / 6 | 7 / 8 | 10 / 11 |
| 3,201–10,000 | 200 | 7 / 8 | 10 / 11 | 14 / 15 |
| 10,001–35,000 | 315 | 10 / 11 | 14 / 15 | 21 / 22 |
Find your lot size, read the sample size, then read the accept and reject numbers for your chosen AQL level. A 1,000-piece order at AQL 2.5 means 80 pieces inspected, 5 major defects accepted, 6 rejected.
3. Which AQL level should you choose?
| Programme | Recommended AQL (major) | Reasoning |
|---|---|---|
| Commodity workwear, low risk | 4.0 | Cost-sensitive, minor defects can be repaired locally |
| Standard bulk workwear | 2.5 | The industry default for commercial quality |
| Branded or retail workwear | 1.5 | Appearance and packaging matter to the end customer |
| Certified PPE, hi-vis, FR | 1.5 plus a 100% functional check | Compliance and safety outweigh sampling economics |
| Private label with retail packaging | 1.5 | A rejected carton at retail costs more than the inspection |
AQL levels apply to majors and minors. Critical defects are zero-tolerance in every programme, and a single needle fragment fails the lot regardless of the AQL result.
4. What to put in the inspection checklist
| Section | What to specify | Example |
|---|---|---|
| Measurement | Points measured and tolerances | Chest ±1 cm, inseam ±1 cm |
| Workmanship | Stitching, tension, symmetry, thread trimming | No skipped stitches, no open seams over 3 mm |
| Components | Zip, button, tape and elastic function | Zip must run the full length without catching |
| Fabric | GSM check, shade consistency, surface defects | No holes, no oil marks, shade within the approved standard |
| Compliance | Labels, standard marking, tape position | EN ISO 20471 class marking and care label present |
| Packing | Polybag, hang tag, carton marks, assortment | Size ratio matches the purchase order |
| Documentation | Certificate of conformity, test reports | Test report number recorded on the inspection report |
5. When to inspect, not just what
| Stage | Purpose | Typical cost |
|---|---|---|
| Fabric inspection on arrival | Catch mill defects before cutting | Included in factory QC |
| Pre-production sample approval | Confirm fit, fabric and branding | Sample fee |
| In-line visit during production | Catch systematic errors early | $250–350 per man-day |
| End-of-line 100% check | Remove obvious defects | Included in the factory price |
| Final random inspection after packing | Confirm the shipment is as ordered | $250–350 per man-day |
The most common mistake is booking only the final inspection. By then a systematic defect has already been repeated across the order. One in-line visit at 20–30% of production usually saves more than it costs.
6. What AQL sampling cannot do
- It cannot prove durability. Washing, abrasion and tape performance need laboratory testing.
- It cannot find every hidden defect. Sampling is statistical by design.
- It cannot replace a specification. If the agreed fabric is 240 g/m² and the shipment is 190 g/m², that is a specification breach, not an AQL result.
- It cannot fix a rejected lot. Agree in advance whether rework, replacement or a price adjustment applies.
7. Frequently asked questions
What does AQL 2.5 mean for clothing?
Up to five major defects are accepted in a sample of 100 pieces. On a 1,000-piece order that is a sample of 80 pieces, with 5 defects accepted and 6 rejected.
What is the standard AQL for garments?
AQL 2.5 for major defects and 4.0 for minor defects is the industry default. Premium and certified protective programmes normally use 1.5 or tighter, plus a 100% functional check on safety-critical features.
How many pieces do you inspect in a 1,000-piece order?
Eighty pieces at general inspection level II. The sample size depends on the lot size, not on the AQL level; changing the level changes the accept and reject numbers instead.
What is the difference between a major and a minor defect?
A major defect affects function, saleability or safety, such as a broken zip, a hole or an out-of-tolerance measurement. A minor defect affects appearance only, such as uneven stitching or a loose thread that can be trimmed.
Is AQL 1.5 better than AQL 2.5?
It is stricter, not automatically better. It requires a higher-quality production run and sometimes a higher price. Use 1.5 for branded, retail or certified protective workwear, and 2.5 for standard commercial orders.
Can a supplier refuse an inspection?
They can, but you should not accept it. Inspection access is a commercial term, and it belongs in the purchase order before the deposit is paid.
What happens if the lot fails inspection?
The usual options are corrective rework and re-inspection, replacement of defective pieces, a price adjustment, or cancellation. Agree the remedy in writing before production rather than after the report arrives.
Do I need a third-party inspection, or can the factory inspect?
For repeat orders with a proven supplier, internal QC plus an occasional independent audit is often enough. For a first order, a new product or certified PPE, an independent inspection is the cheapest insurance available.
Set your AQL standard before the deposit
Send us your product and quantity, and we will confirm the inspection level, sample size and defect definitions in your quotation, so the quality standard is agreed before production starts rather than argued about afterwards.
