t shirt shrinkage percentage
Every cotton knit shrinks. The problem is not that it shrinks — it is that a size run which shrinks unevenly leaves the customer with a shirt that no longer matches its own label, and that is a return.
Send the weight, colour, fit and quantity. We return a unit price per quantity tier within 24 hours.
Knitting bends yarn into loops under tension. Those loops want to return to a relaxed state, and water plus heat lets them. That is relaxation shrinkage, and it happens in the first wash whether or not the fabric was pre-shrunk.
On top of that there is felting and consolidation in the wash, which is smaller for cotton than for wool but still present. Together they produce the 4–6% most buyers see in length.
A standard 180–200gsm cotton jersey moves about 4–6% in length and 2–4% in width on a 30–40 °C wash with a tumble dry. Width is smaller because the knit has less loop distortion in that direction.
Heavier knits relax more in absolute terms because there is more loop structure to recover — expect the top of that band or slightly above for 260–300gsm.
Polyester blends move less, and the higher the poly share the smaller the change. CVC sits between the two.
Pre-shrunk (compacted) fabric is mechanically compressed during finishing so most of the relaxation happens before cutting. Expect under 3%, and — more useful — expect it to be consistent across dye lots.
A programme where every shirt shrinks 6% has a consistent outcome, and the size specs can be written to account for it. A programme where a medium shrinks 3% and a large shrinks 7% produces a size run that no longer matches its own labels — and the customer notices on the second wash, not the first.
Uneven shrinkage comes from three places: mixed fabric lots in one order, insufficient relaxation before cutting, and a finish that varies across the roll.
Specify the shrinkage limit in the purchase order, not the fabric description: "length shrinkage ≤ 5% after one wash at 40 °C, tumble dry low". A fabric described as pre-shrunk with no number is a claim, not a spec.
Check it on the sample with three pieces from different positions in the roll, washed the same way. The spread between them is the number that matters more than the average.
A 60 °C wash with a hot tumble dry can double the expected shrinkage, and that is a care-label problem rather than a fabric problem. Clear washing instructions on the neck label and the hangtag are the cheapest mitigation available.
Shrinkage is normal. A size run that shrinks unevenly is a defect, and it is the one that produces returns.
| Cotton jersey | 4–6% length · 2–4% width |
|---|---|
| Cotton heavyweight | 5–7% length |
| CVC | 2–4% length |
| 65/35 poly-cotton | 1–2% length |
| Pre-shrunk cotton | Under 3%, tighter spread |
| Test method | One wash at 40 °C, tumble dry low, measure flat |
About 4–6% in length and 2–4% in width for a standard jersey on a 40 °C wash. Heavier knits are at the top of that range; pre-shrunk fabric is under 3%.
No. It means most relaxation shrinkage was done during finishing. The shirt still moves slightly, but far less and — more importantly — more consistently across a size run.
It reduces it but does not eliminate it: relaxation happens with water alone, and a cold wash still allows most of it. Cold plus line dry gets closest to no change.
Almost always mixed fabric lots or insufficient relaxation before cutting. The fabric was not the same across the size run, so the change was not the same either.
Only if the fabric was not pre-shrunk and the shrinkage number is known. Ordering up on a pre-shrunk shirt produces a shirt that is simply too big after the first wash.
A fabric swatch and a sewn sample come before the bulk run, and finished goods are photographed before packing.