Garment shrinkage needs a defined measurement and care process. Asking for “no shrinkage” without a method leaves the buyer and factory comparing different conditions. Agree which dimensions matter, how they are measured and what change is acceptable for the intended garment.
Record the starting point correctly
Identify the sample, fabric lot, size and specification version. Measure the agreed points before washing using a consistent method. Record the units and whether the measurement is a flat width or a full circumference. Keep photographs for any point that could be interpreted differently.
Choose the wash and drying conditions relevant to the proposed care instructions and the assessment you need. Where formal laboratory testing is required, agree the current method and acceptance criteria with the testing provider. An informal workshop check and a laboratory report serve different purposes.
Calculate and interpret dimensional change
Percentage change can be calculated as (after minus before) divided by before, multiplied by 100. For example, a dimension changing from 70 cm to 68.6 cm gives minus 2 percent. This is an arithmetic example, not a recommended acceptance limit.
- Assess length and width separately rather than reporting one garment number.
- Review body fabric, rib, lining and trims for different changes.
- Check twisting, seam appearance and shape as well as dimensions.
- Repeat the agreed process after material or finishing changes where relevant.
Use the result to control development
If the result is outside the agreed requirement, identify the corrective action and produce a revised sample where needed. A pattern adjustment may address dimensions but does not automatically resolve twisting or differential component behaviour. Keep the final care-reviewed sample linked to the production file.
Do not substitute fabric after approval without assessing the effect on dimensions and fit. A nominally identical fibre blend can have a different construction or finishing history.
Questions about shrinkage statements
Does “preshrunk” mean the garment cannot change?
Ask what processing and evidence support the term and what result is expected under the agreed care conditions.
Can the size chart simply include extra length?
Any allowance needs validation on the selected material and finished garment. Review the fit before and after care, not only a numerical correction.
For background, see CottonWorks on cotton knit processing. Use the revision checklist and share your garment and care requirements.