Fabric guide
What fabric shrinkage is, why length and width are measured separately, and how to put a usable tolerance in a specification before the first sample is cut.
In short
Fabric shrinkage is the change in length or width after washing, drying, steaming or finishing, expressed as a percentage of the original dimension. It is measured separately in the warp or wale direction and the weft or course direction because the two rarely move equally. A specification that names only “low shrinkage” has not named a number the factory or the inspector can work to.
6 min read
Reviewed by AHM International product development team
Last reviewed August 2026
What shrinkage actually measures
Shrinkage is dimensional change, not a quality score. A fabric can shrink and still be correct for the program if the pattern and marker were built with that change in mind. The problem is surprise: a garment graded to a sealed sample that was never washed will not match the sealed sample after the first industrial laundering.
The usual formula is straightforward. Shrinkage percent equals the original dimension minus the final dimension, divided by the original dimension, times one hundred. What matters commercially is when you measure — grey fabric, finished fabric, or after a wash method that matches the buyer’s laundry — because each stage can move the number.
Buyers sometimes treat a single percentage as enough. It is not. Length and width must both be stated, because a fabric that is stable in one direction and lively in the other will twist seams, skew panels and open gaps at pocket mouths even when the “average” looks acceptable.
Orientation ranges, not guarantees
Common industry conversation bands for finished apparel fabrics. Your program’s wash method, fibre and finish decide the real figure. Agree the test method with the manufacturer rather than quoting a number from a brochure.
| Construction | Often discussed as | Why it moves |
|---|---|---|
| Woven workwear / shirting | Around ±3% per direction after an agreed wash | Fibre, weave density, and whether the cloth was pre-shrunk |
| Knit jersey / pique | Often looser than woven — commonly discussed near ±5% | Loop structure recovers differently length vs width |
| Performance / premium programs | Tighter bands when the buyer specifies them | Buyer standard and laundry method override market habit |
What to put in the tech pack
- Direction
- Separate limits for length (warp/wale) and width (weft/course). One number for both hides the risk.
- Test method
- Name the wash temperature, cycles and drying method you care about — domestic, industrial, or a named lab method.
- Stage of measurement
- Finished fabric before cut, or after a defined wash. Grey GSM and post-finish behaviour are not the same conversation.
- Pattern consequence
- If shrinkage is expected, say whether the pattern is already compensated or whether the factory must build allowance into the marker.
- Related weight
- When cloth shrinks in both directions, mass concentrates: post-wash GSM can rise even when the delivery looked “within tolerance.”
Pre-shrinking is a conversation, not a slogan
Processes such as sanforization on cotton wovens exist to reduce residual shrinkage before cutting. Naming “pre-shrunk” without a residual tolerance still leaves the factory guessing what will pass inspection.
Knits are a different problem. Mechanical and chemical finishing can calm them, but a buyer who washes hot and tumble-dries hard will see more movement than a lab wash that never matches the field. Match the test to the laundry, or the sealed sample will not survive contact with reality.
If you do not know the number yet
Describe how the garment is washed in the field and whether fit must hold after the first wash. A manufacturer can propose a residual shrinkage band and a test method for approval. Inventing a tight percentage without a method usually produces either an expensive fabric choice or a dispute at inspection.
Related questions
It is a common conversation band, not a universal rule. Some buyers specify tighter; some wash methods need a wider allowance. The acceptable figure is the one both sides agree against a named test, written into the specification.
Warp and weft yarns, or wales and courses in a knit, are not under the same tension in the mill or on the garment. Finishing can bias one direction. Measuring only the larger of the two still leaves the other free to distort the garment.
If the cloth contracts in area while the fibre mass stays, grams per square metre rise. That is why costing and consumption conversations should know whether a quoted GSM is grey, finished, or after wash.
Send one specification and we will apply exactly this thinking to your style. Construction, materials and commercial FOB costing.
Explore next