You've sourced the knitted cardigans. You've approved the sample. But the bulk production arrives and — the cable is distorted, the buttons are crooked, and two sizes measure differently from the spec.
Sound familiar? It happens more often than it should, and almost always because the buyer skipped or rushed the quality control step.
Whether you're working with a factory directly or through a knitwear sourcing partner, this checklist covers the 12 inspection points that separate acceptable production from costly returns.
Why QC Matters More for Knitwear Than Woven
Knitted garments behave differently from woven:
- They stretch — measurements can shift during production, packing, and transit
- They shrink — improper relaxation or finishing causes dimensional change
- They pill — yarn quality and washing process determine long-term appearance
- They distort — cable patterns, ribbing, and linking points create tension asymmetry
A woven shirt off by 1cm is barely noticeable. A cable knit cardigan off by 1cm in the chest can look like a different size.
The 12-Point Knitwear QC Checklist
1. Dimensional Check (Measurements)
What to check: Compare 5+ garments per size against your approved size spec.
Key measurements for cardigans:
- Chest (1" below armhole)
- Body length (HPS to hem)
- Sleeve length (center back to cuff)
- Shoulder width (seam to seam)
- Front placket width (cardigan-specific)
- All pieces in one order must come from the same dye lot
- Check for shade variation between body, sleeves, and button bands
- For mélange/heather yarns, verify the fiber blend is consistent (color shifts often indicate yarn substitution)
- Cable knit cardigans: Are cable crossings consistent? Are left and right front panels mirror images?
- Rib patterns: Is the rib uniform across the garment? Any dropped stitches?
- Fair Isle / jacquard: Are floats caught properly? Any pattern misalignment at seams?
- Seams are straight and flat — no twisting or puckering
- Linking stitches are even and match the garment gauge
- Shoulder seams are properly reinforced
- Side seams align front-to-back
- All buttons securely attached (pull test: 8 lbs minimum)
- Buttonholes are clean-cut, not fraying
- Button spacing is even
- Buttons align with buttonholes when closed
- Zipper opens and closes smoothly
- No fabric caught in zipper teeth
- Zipper tape lies flat, not rippled
- Zipper color matches garment
- Length: ≤5%
- Width: ≤5%
- Rib edges: ≤8%
- No thick/thin places in the yarn (visible as uneven knitting)
- No foreign fiber contamination
- No yarn knots visible on the surface
- No color streaks or barre (fabric bands)
- Care label matches the actual wash test results
- Fiber content label is accurate (tolerance: ±3%)
- Size label matches the measured dimensions
- Brand labels and hangtags are correctly positioned
- Each garment individually folded with tissue paper (prevents color transfer)
- Correct size ratio per carton
- Carton markings match packing list
- No moisture damage or mold
- Sample size per order quantity (per ISO 2859-1)
- Defect classification: Critical / Major / Minor
- Accept/reject based on AQL table
- Critical defects: 0 allowed
- Major defects: ≤2.5% of sample
- Minor defects: ≤4.0% of sample
Tolerance: ±1.5cm for body, ±1cm for sleeve. Anything outside this is a fail.
Common issue: Oversized knit cardigans are particularly prone to measurement drift because the relaxed silhouette makes small variations harder to spot visually — but they show up in fit.
2. Color Consistency
What to check: Compare garments across the production batch under D65 (daylight) light source.
Standard: ΔE < 1.0 between pieces (measured by spectrophotometer). If you don't have instrument access, use a grey scale — Grade 4+ is acceptable.
3. Stitch Quality & Pattern Alignment
What to check:
Fail criteria: Any dropped stitch, broken pattern, or asymmetrical cable is a reject.
4. Linking & Seaming
What to check:
Cardigan-specific: Check that the front opening edges (placket) are straight and even — a wavy front edge is the #1 visible defect on cardigans.
5. Button Attachment & Buttonholes
What to check:
Pro tip: Specify reinforced button attachment (shank button with backing button on the inside) for chunky knit cardigans — the thick fabric puts extra stress on buttonholes.
6. Zipper Function (if applicable)
What to check:
7. Wash & Shrinkage Test
What to check: Wash 2-3 sample garments per the care label instructions, then re-measure.
Standard: Max shrinkage after 5 wash cycles:
Critical for: Merino wool and fine-gauge styles. If your women's knit sweater is labeled "machine washable" but shrinks 8% after one wash, you have a liability issue.
8. Pilling Resistance
What to check: Martindale abrasion test (ISO 12945-2) or random tumble pilling test (ISO 12945-1).
| Grade | Assessment | Action |
|---|---|---|
| 5 | No pilling | ✅ Accept |
| 4 | Slight surface fuzz | ✅ Accept for mid-market |
| 3 | Moderate pilling | ⚠️ Borderline — negotiate or reject for premium |
| 2 | Significant pilling | ❌ Reject |
| 1 | Severe pilling | ❌ Reject |
Red flag: If a supplier resists providing pilling test results, assume the worst.
9. Yarn & Fabric Defects
What to check:
Inspection method: Inspect each garment on a light table or under bright light at arm's length.
10. Labeling & Care Instructions
What to check:
Compliance note: EU Regulation 1007/2011 requires accurate fiber content labeling. US FTC has similar requirements. Non-compliance can result in customs holds and market withdrawal.
11. Packing & Presentation
What to check:
Cardigan-specific: Fold cardigans buttoned up to maintain front-edge shape during transit.
12. AQL Final Inspection
What to check: Perform a statistical final inspection using AQL 2.5 (standard for garment production):
Typical pass criteria:
Who Should Do the QC?
| Option | Pros | Cons |
|---|---|---|
| Your own QC team on-site | Full control, direct communication | Expensive, requires travel or local hiring |
| Third-party inspection company | Independent, certified (SGS, Intertek, BV) | Adds cost ($200-400/day), limited knitwear specialization |
| Your sourcing partner's QC team | Cost-effective, knitwear-specific expertise | Must verify independence from factory |
Best practice: Use a sourcing partner with dedicated QC for ongoing orders, supplemented by periodic third-party audits for new suppliers or large orders.
Red Flags During QC
🚩 Factory refuses unannounced inspection — They may be hiding something
🚩 "We don't do AQL inspections" — Non-negotiable for any production order
🚩 Sample is perfect, bulk is not — Ask for mid-production inspection, not just final
🚩 Rushed QC before shipment — If the factory pressures you to approve QC in 24 hours, push back
🚩 No wash test results available — This is non-negotiable for any wholesale knitted cardigan order