Quality control in clothing manufacturing ensures every garment meets your specifications before reaching customers. Poor quality leads to returns, bad reviews, and damaged brand reputation. This guide covers inspection methods, defect classification, and how to build quality into your production process.
🔍 Key Takeaways
- Standard AQL: 2.5 for major defects, 4.0 for minor
- Three defect levels: critical, major, minor
- Measurement tolerance: ±0.25-0.5 inches
- Pre-shipment inspection when 80%+ production complete
- Document all quality standards in tech pack
Types of Quality Inspections
| Inspection Type | When | Purpose |
|---|---|---|
| Pre-production | Before bulk starts | Verify materials, samples |
| Inline inspection | During production | Catch issues early |
| Pre-shipment (PSI) | 80-100% complete | Final quality gate |
| Container loading | Before shipping | Verify quantity, packaging |
Defect Classification
Critical Defects (Zero Tolerance)
- Safety hazards (sharp objects, flammability)
- Complete wrong product
- Major measurement errors (2"+ deviation)
Major Defects (AQL 2.5)
- Broken seams, holes
- Significant color variation
- Wrong size label
- Missing components (zippers, buttons)
Minor Defects (AQL 4.0)
- Loose threads
- Small fabric imperfections
- Slight print misalignment
- Minor measurement variance (within tolerance)
AQL Sampling Explained
AQL (Acceptable Quality Level) determines sample size and acceptable defects:
| Batch Size | Sample Size | Max Major (AQL 2.5) | Max Minor (AQL 4.0) |
|---|---|---|---|
| 51-90 | 13 | 1 | 2 |
| 91-150 | 20 | 1 | 2 |
| 151-280 | 32 | 2 | 3 |
| 281-500 | 50 | 3 | 5 |
| 501-1200 | 80 | 5 | 7 |
Need Quality Assurance?
Sanchuan Apparel provides inspection reports, photos at every stage, and welcomes third-party audits. Quality is built into our process.
Learn About Our QC →Quality Control Checklist
Before Production
- Approve pre-production sample
- Verify fabric quality and weight
- Confirm trims and accessories
- Review tech pack with factory
During Production
- Inline inspection at 20%, 50%, 80%
- Check measurements against spec
- Verify construction quality
- Photo documentation
Before Shipping
- Full pre-shipment inspection
- Verify quantity matches order
- Check packaging and labeling
- Sign off on quality report
Frequently Asked Questions
What is AQL in clothing inspection?
AQL (Acceptable Quality Level) is a statistical sampling method that determines how many defects are acceptable in a batch. Standard AQL for clothing is 2.5 for major defects and 4.0 for minor defects. This means in a sample of garments, up to 2.5% major defects pass inspection. Sanchuan Apparel uses AQL 2.5 as standard and provides inspection reports.
What are common defects in clothing manufacturing?
Common clothing defects include: sewing defects (skipped stitches, broken seams), fabric defects (holes, runs, color variation), sizing issues (measurements outside tolerance), finishing defects (loose threads, untrimmed edges), and labeling errors (wrong size tag, missing care label). Critical defects (safety issues) result in rejection; major defects affect usability; minor defects are cosmetic.
How do I ensure quality in clothing production?
Ensure quality by: providing detailed tech packs, requesting pre-production samples, conducting inline inspections during production, requiring final inspection before shipping, and using third-party auditors for large orders. Document all quality standards in writing. Sanchuan Apparel provides photos at every production stage and welcomes third-party inspection.
What is a pre-shipment inspection?
Pre-shipment inspection (PSI) is a quality check performed when 80-100% of production is complete. Inspector randomly samples garments according to AQL standards, checking measurements, construction, and appearance. If the sample passes, the batch ships. If it fails, manufacturer must fix issues. PSI costs $150-300 per day but prevents costly returns.
What tolerance is acceptable for clothing measurements?
Industry standard measurement tolerance is ±0.25 to ±0.5 inches depending on the measurement point. Critical measurements (chest, length) typically have ±0.5 tolerance; detail measurements (neck width, sleeve opening) have ±0.25. Tolerances should be specified in tech packs. Sanchuan Apparel adheres to specified tolerances and documents measurements.
By Sanchuan Apparel | Updated March 2026