Production problem
Why do garment measurements change after washing?
Three different behaviours are usually described as shrinkage, and they have different causes and different fixes. Relaxation is the fabric recovering from tension, residual shrinkage is fibre and structure contracting in water and heat, and growth is a garment getting longer or wider in wear. A measurement chart that does not state whether it applies before or after washing cannot distinguish any of them.
What you are seeing
The goods were inspected against the measurement chart and passed, and after the first domestic wash the body length is short, the chest has narrowed, or in some cases a bottom-weight garment has grown. The change is consistent across the order rather than random.
Contents
This is a common technical dispute in apparel, and it is often caused by an unstated assumption rather than by a manufacturing error. The factory measured the garment in the state it left the line. The buyer measured it after a wash. Both measurements can be correct, and the specification never said which one governed.
Three behaviours, one word
| Behaviour | What causes it | How it shows | Where it is fixed |
|---|---|---|---|
| Relaxation | Fabric held under tension during knitting, dyeing and finishing recovering once it is free | Mostly a length reduction, appearing at the first wash and then largely stopping | Fabric finishing and relaxation before cutting |
| Residual shrinkage | Fibre swelling and structural contraction in water and heat | Progressive over the first few washes, worse at higher temperatures and with tumble drying | Fabric selection, finishing, and pattern allowance |
| Growth | Elastic recovery failure, or a structure extending under load | Garment becomes longer or wider in wear rather than in the wash, common at knees, seats and cuffs | Fabric elastane content and recovery, and rib specification |
Cotton knits are dominated by the first two. Elastane-containing fabrics can show shrinkage and growth at the same time, contracting in the wash and extending in wear, which is why they need a specification that addresses both.
Why the two measurements disagree
Before assuming a fault, check that both parties measured the same thing. Four variables account for much of the gap.
- State. Was the garment measured as produced, or after washing? This is a common omission in a tech pack. For a product that is washed or dyed after sewing there is a further state to name, because that process changes dimensions before the garment is ever shipped.
- Relaxation time. A garment measured immediately after pressing measures differently from the same garment measured after resting. Factories normally allow finished goods to settle before final measurement.
- Method. Chest measured 2.5 cm below the armhole and chest measured at the widest point are different numbers on the same garment. Points of measure must be defined, not named.
- Tension. Knitted and stretch fabrics can be measured flat and relaxed or gently extended. For stretch garments the chart must say relaxed, or two people will never agree.
The test chain that settles it
Dimensional change is measurable under published methods, and once a programme uses them the argument becomes arithmetic. Three ISO standards work together.
- ISO 3759 covers preparing, marking and measuring the specimen, including the benchmarks applied before treatment.
- ISO 6330 specifies the domestic washing and drying procedures, including reference detergents and ballast, so that a wash is repeatable rather than approximate.
- ISO 5077 specifies how the dimensional change is determined from the before and after measurements.
The practical value is that a specification can then say something enforceable: dimensional change to be within a stated percentage in length and width after a named wash procedure, tested to those methods. Without that, a shrinkage complaint is one party's laundry against another's.
How a factory controls it
Two controls do much of the work, and both happen before cutting. Fabric is relaxed after the rolls are opened so it is not spread and cut under tension, and the pattern carries an allowance based on the fabric's tested behaviour so that the garment lands on the chart after washing rather than before it. Compacting during finishing reduces how much movement is left in the fabric at all.
What a factory cannot do is correct an unstable fabric at the sewing machine. If a fabric was never tested and turns out to move four percent in length, every garment cut from it carries that behaviour.
Where the responsibility sits
Buyer specification
- State whether the measurement chart applies before or after washing
- Define every point of measure and how it is taken
- State the wash and dry procedure the product must survive
- Set a dimensional change limit and require it to be tested
- Make the care label consistent with what was tested
Factory execution
- Test the fabric before bulk and report the result
- Relax fabric before spreading and cutting
- Build the tested allowance into the pattern
- Let finished goods settle before final measurement
- Raise it at fabric approval if the chosen fabric cannot meet the limit
If it has already happened
- Measure an unwashed piece from the same delivery against the chart. If it passes, the goods left the factory correct and the question is about fabric behaviour, not workmanship.
- Wash a second piece under the conditions stated in your specification and measure it again, recording the exact procedure.
- Compare both against the sealed approved sample, washed and unwashed if you have the pieces.
- Establish which measurements moved and by how much, in centimetres and as a percentage.
- Then decide the commercial question: whether the fabric was outside an agreed limit, or whether no limit was ever agreed. Those lead to different conversations.
Setting the limits and the inspection standard in advance is covered in the quality control guide, and how measurements and tolerances are built is in the pattern and grading guide. How a test is designed and read before bulk is covered in wash testing before bulk production.
Questions this raises
Is some shrinkage normal?
Yes. Cotton knits in particular move at the first wash, and no finishing process removes all of it. What makes it acceptable or not is whether it falls inside a limit that was agreed and tested before production.
Why does length shrink more than width?
Because knitted fabric is held under tension lengthwise during production and finishing, so most of the stored strain releases in that direction. Width can also change, and on some structures the fabric widens as it shortens.
Can the pattern compensate for shrinkage?
Yes, and it normally does. The pattern is cut larger by the tested amount so the garment lands on the chart after washing. That only works if the fabric was tested first, which is why an untested fabric is the real risk rather than the shrinkage itself.
Our garments got longer rather than shorter. Is that possible?
Yes, and it is usually growth rather than shrinkage. Structures with elastane can extend in wear and fail to recover fully, and heavy fabrics can drop under their own weight. It is a recovery specification issue rather than a wash issue.
Want the chart and the customer to agree?
Send your measurement chart and the washing your product will face. We will confirm whether the fabric can hold it, propose the test, and state clearly whether the chart applies before or after washing.
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