Common Garment Defects: Classification and Field Guide

The critical, major, minor system

Garment inspection worldwide sorts every fault into three classes. Critical defects are those that could harm the user or breach law: a broken needle fragment in a garment, a burning-hazard non-compliance, a mould contamination. Major defects make the garment unsellable or likely to be returned: holes, broken stitching, visible stains, wrong size label, measurements outside tolerance, malfunctioning zips. Minor defects are noticeable flaws a customer would probably accept: an untrimmed thread, a slightly wavy topstitch in a hidden area, minor shade variation inside tolerance.

The classes drive different responses. Criticals are zero-tolerance: one confirmed critical fails the inspection regardless of statistics, and triggers containment such as full metal detection of the lot. Majors and minors are counted against allowances set by the AQL level you chose. The same physical fault can classify differently by context: a loose thread on the outside chest of a minimal tee is more serious than the identical thread inside a cargo pocket, which is why inspection briefs matter.

Brands should issue their own defect classification list rather than leaving judgement entirely to the inspector on the day. A one-page table, this fault is major, this is minor, for our product, aligned with photos, removes most of the arguing from inspection day and makes results comparable across orders and factories.

Fabric and material defects

Fabric faults are the most expensive class because they are bought by the metre and discovered by the garment. The classics: holes and tears, slubs and thick yarns in fabrics where they are not a design feature, barre, which is visible horizontal striping in knits from yarn or tension variation, shade variation between rolls or within a roll, misprints and off-grain prints, and finishing faults such as crease marks or water spots from dyeing.

Two fabric-adjacent defects dominate customer complaints after delivery: pilling, which shows up after a few wears on loosely twisted or short-staple yarns, and colourfastness failures, where dye rubs off, crocking, or bleeds in the wash. Neither is reliably visible at final inspection, which is why fabric testing before bulk cutting, for pilling, rub fastness and wash fastness, exists as a discipline separate from garment inspection.

The operational defence is a fabric relaxation and inspection step at the factory before cutting, commonly using the four-point system to score rolls, plus retained shade cards per roll for cut planning. Ask your factory whether incoming fabric is inspected and what happens to rolls that fail; the answer tells you a lot about how the rest of the operation runs.

Sewing and construction defects

Sewing faults are the largest category by count in most inspections. The recurring set: broken or skipped stitches, open seams, seam pucker, especially on lightweight wovens, raw edges where overlocking missed, twisted seams and legs, uneven stitch density, wavy hems on knits from differential stretching, and mismatched checks or stripes at seams on patterned fabric.

Component-level faults follow: zips that catch, wave or fail, buttons insecurely attached or misaligned with buttonholes, snaps that do not close or pull through the fabric, and drawcords of unequal length. On printed and embroidered garments, add misplaced or crooked artwork, print cracking after cure failures, embroidery bird-nesting on the reverse and puckering around dense stitch areas.

Most sewing defects are operator- or machine-setting-level problems that inline inspection catches at the station where they occur, when one seam can be repaired in seconds. The same defect found at final inspection means unpicking a finished garment or downgrading it. This is the economic argument for factories with real inline QC rather than a single end-of-line check, and it is a fair question to ask any factory you evaluate.

Finishing, measurement and packing defects

After sewing, a garment can still be ruined. Finishing defects include stains from machine oil or handling, unremoved chalk or marker lines, untrimmed threads, scorching or glazing from careless pressing, and odour from poor drying. Measurement defects, key dimensions outside the tolerance table, sit here too, often traced upstream to cutting or shrinkage rather than sewing.

Labelling and packing defects are mundane and disproportionately costly: wrong care or fibre label in the garment, size label not matching the garment's actual size, size sticker mismatched to the polybag contents, missing hangtags, wrong pack ratios in cartons, and missing or unscannable barcodes. For e-commerce, a barcode that does not scan is functionally a defective unit even though the garment is perfect.

Because these faults arrive last, they concentrate in the final ten percent of the timeline when everyone is rushing, and they are exactly what a pre-shipment inspection at the packed stage is designed to catch: the standard practice of pulling packed cartons at random and checking garments, labels, polybags and carton contents against the order in one pass.

Top defects by garment type

Different products fail in different characteristic ways, and inspection briefs should weight accordingly. T-shirts and jersey tops: twisted side seams from tubular fabric torque, wavy hems, neckline stretching out of shape, print faults and shade variation between body and rib. Hoodies and sweats: uneven or misaligned pockets, hood asymmetry, drawcord faults, fleece pilling and metal trim finish damage.

Denim: shade variation between garments after wash, whisker and abrasion placement inconsistency, waistband twist, crotch seam strain, hardware rust or sharp edges, and out-of-tolerance shrinkage since measurements are taken after washing. Dresses and blouses in light wovens: seam pucker, slippage at stressed seams, uneven hems on bias-cut panels, and interfacing bubbling after wash. Knitwear: dropped stitches, linking faults at shoulder and neck seams, hand-feel variation between dye lots and dimensional instability, garments growing or shrinking.

Outerwear adds its own list: quilting irregularities, down or wadding migration, delaminating membranes, faulty waterproof zips and untaped seam sections. The point of these lists is not completeness but focus: an inspector with two hundred garments and one day finds more of what matters when the brief says where this product usually fails.

• T-shirts: twisted seams, wavy hems, neckline recovery, print faults
• Hoodies: pocket alignment, hood symmetry, drawcords, pilling
• Denim: wash shade variation, waistband twist, hardware, post-wash measurements
• Shirts and blouses: seam pucker, collar symmetry, pattern matching
• Knitwear: dropped stitches, linking faults, dimensional stability
• All products: labels, barcodes and pack accuracy at the packed stage

How AQL turns defect counts into decisions

AQL, acceptance quality limit, is the sampling standard, ISO 2859-1 and equivalents, that makes inspecting a fraction of a shipment statistically meaningful. From the lot size, a sample size is drawn, commonly at general inspection level II, and the chosen AQL values set the maximum accepted defect counts in that sample. Apparel convention is AQL 2.5 for majors and 4.0 for minors, with zero tolerance for criticals; premium programmes tighten to 1.5 or 1.0 for majors.

A concrete, illustrative example: a 3,000-piece lot at level II draws a sample of 200 garments; at AQL 2.5 the shipment passes with up to 10 major defects in the sample and fails at 11 or more, with minors counted separately against their own allowance. The output is a pass or fail against the standard you pre-agreed, which is what makes the balance-payment-after-inspection structure workable: the trigger is objective.

Three habits make AQL work in practice. Agree the AQL levels and your defect classification in the order confirmation, not on inspection day. Inspect when goods are at least 80 percent packed, so the sample represents the shipment. And treat a failed inspection as a process, not a war: the factory sorts and reworks the lot, a re-inspection follows, and the defect data feeds back into the next order's inline checks. Factories improve for buyers who measure.