🔍 QC Guide

Quality Control in Clothing Manufacturing: A Complete Checklist

Q: What is AQL in clothing manufacturing?

AQL (Acceptable Quality Level) is a statistical standard for quality inspections. For clothing, standard AQL is 2.5 for major defects and 4.0 for minor defects. This means: for major defects, no more than 2.5% of items can fail; for minor defects, up to 4% can fail. Most brands use AQL 2.5 as the standard.

Q: What are the stages of quality control?

QC has 4 main stages: 1) Pre-production inspection (fabric, materials), 2) During production inspection (DPI) - when 10-20% complete, 3) Pre-shipment inspection (PSI) - final random sampling, 4) Loading supervision - checking packed containers. Each stage catches different issues at different cost points.

Q: What are common clothing defects?

Clothing defects are categorized: Critical (unacceptable): broken zipper, missing parts. Major: color mismatch, wrong size, open seams, staining. Minor: loose threads, small imperfections, minor measurement deviations. Any critical defect fails the entire lot. Major defects typically allow max 2.5% (AQL 2.5). Minor defects max 4%.

By Sanchuan Apparel | March 20, 2026 | 12 min read

Why Quality Control Matters

Quality control protects your brand reputation and prevents costly returns. A single defective product can damage customer trust, while systematic QC ensures consistent quality across thousands of units.

✅ QC Best Practices

Inspect at multiple production stages
Use standardized AQL criteria
Document all findings with photos
Provide clear feedback to factory
Track defect rates over time

Four Stages of Quality Control

🔴 Stage 1: Pre-Production Inspection (PPI)

When: Before bulk production begins

Purpose: Verify materials, components, and processes

Fabric quality and color
Trims and accessories (buttons, zippers, etc.)
Labels and branding
Initial sample approval
Production planning review

🟡 Stage 2: During Production Inspection (DPI)

When: 10-30% production complete

Purpose: Catch issues early

Check initial production quality
Verify construction methods
Measurement checks
Color consistency
Workmanship quality

🔴 Stage 3: Pre-Shipment Inspection (PSI)

When: 80-100% production, before shipping

Purpose: Final random sampling

Full random sampling (AQL inspection)
100% functional checks
Packaging verification
Label accuracy
Carton condition

🟢 Stage 4: Loading Supervision

When: During loading into containers

Purpose: Ensure correct goods loaded

Verify carton count
Check for damage during loading
Seal verification
Container condition

Understanding AQL Standards

📚 What is AQL?

AQL (Acceptable Quality Level) is the worst tolerable quality level. AQL 2.5 means you accept up to 2.5% defective items as "normal."

AQL for Different Defect Types

Defect Type	AQL	What It Means
Critical	0%	Zero tolerance - any fails inspection
Major	2.5%	Max 2.5% defective allowed
Minor	4.0%	Max 4% defective allowed

Sample Size by Order Quantity

Order Size	Sample Size (AQL 2.5)	Pass Criteria
1,201-3,200	125 pcs	Max 7 major, 10 minor
3,201-10,000	200 pcs	Max 10 major, 14 minor
10,001-35,000	315 pcs	Max 14 major, 21 minor
35,001-150,000	500 pcs	Max 21 major, 21 minor

Defect Categories

🔴 Critical Defects (Zero Tolerance)

Safety hazards (sharp objects, loose parts)
Missing components
Wrong product entirely
Fabric testing failure (harmful substances)
Complete color mismatch

🟠 Major Defects

Open seams (>0.5cm)
Color shading across pieces
Measurement deviation >2cm
Missing or broken zippers
Print/embroidery misalignment
Fabric flaws in visible areas
Wrong labeling

🟢 Minor Defects

Loose threads (easily trimmed)
Small measurement deviations (<2cm)
Slight color variation
Minor stitching imperfections
Small fabric irregularities in hidden areas

Comprehensive QC Checklist

📋 Pre-Shipment Inspection Checklist

1. Visual Inspection

☐ Overall appearance matches approved sample
☐ Color consistent across all pieces
☐ No visible stains, holes, or defects
☐ Print/embroidery aligned and complete
☐ Symmetry (shoulders, sleeves, etc.)

2. Construction

☐ Seams straight and secure
☐ No open seams
☐ Stitching even and correct density
☐ Button holes properly finished
☐ Zippers work smoothly

3. Measurements

☐ Chest/bust within tolerance
☐ Length correct
☐ Sleeve length correct
☐ All sizes represented correctly

4. Labels & Tags

☐ Brand label correct
☐ Size labels correct
☐ Care instructions accurate
☐ Country of origin correct

5. Packaging

☐ Folding correct
☐ Poly bag intact
☐ Carton labeling correct
☐ Master carton secure

Functional Tests

Standard Tests

Zipper test: Open/close 10 times
Button test: Check secure attachment
Stretch test: Check elastic recovery
Color fastness: Rub with white cloth
Seam strength: Pull gently on seams

Working with Your Factory

Communication Tips

Provide clear quality specifications upfront
Share reference samples for each style
Request photos during production
Schedule regular video calls for updates
Provide detailed feedback with photos

When to Request Rework

Major defects above AQL
Any critical defects
Measurement deviations
Color inconsistency

FAQ

What is AQL in clothing manufacturing?

AQL (Acceptable Quality Level) is a statistical standard for quality inspections. For clothing, standard AQL is 2.5 for major defects and 4.0 for minor defects. This means: for major defects, no more than 2.5% of items can fail; for minor defects, up to 4% can fail. Most brands use AQL 2.5 as the standard.

What are the stages of quality control?

QC has 4 main stages: 1) Pre-production inspection (fabric, materials), 2) During production inspection (DPI) - when 10-20% complete, 3) Pre-shipment inspection (PSI) - final random sampling, 4) Loading supervision - checking packed containers. Each stage catches different issues at different cost points.

What are common clothing defects?

Clothing defects are categorized: Critical (unacceptable): broken zipper, missing parts. Major: color mismatch, wrong size, open seams, staining. Minor: loose threads, small imperfections, minor measurement deviations. Any critical defect fails the entire lot. Major defects typically allow max 2.5% (AQL 2.5). Minor defects max 4%.

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