Hoodie shrinkage: what to measure before and after washing

Separate the intended silhouette from dimensional change

For a UK streetwear collection, a deliberately short body or wide chest belongs in the design specification. A change from the delivered dimensions after care belongs in a separate review. Keeping those decisions apart helps you discuss a cropped hoodie without treating its original proportions as a fault.

Cole Buxton’s Eagle Zipped Hoodie page describes both a signature shrunken fit and a preshrunk finish. That is a useful example of design and processing language appearing together. The description is a product observation, not a quantified laundering report or evidence that demand for this silhouette is increasing.

Our recommendation is to ask two questions of your own sample: does it match the intended size before care, and does it remain within your agreed requirements afterwards? Write an answer to each instead of using one general fit approval.

Sources: Cole Buxton

Why one shrinkage percentage cannot describe every hoodie

CottonWorks defines dimensional change as either growth or shrinkage. Its guidance identifies fabric construction, processing, finishing and garment care among the influences, and explains that changes can affect the relationship between the body fabric and trims. It advocates specifications developed around the actual product rather than arbitrary limits.

For your buying brief, keep body length, chest width and sleeve length as separate results. A single overall number can hide which part changed. Also record visible changes in the hem, cuffs and hood, but keep those observations separate from measured dimensions. A photograph of a wavy seam does not tell you how many centimetres the body lost.

Sources: CottonWorks / Cotton Incorporated

Agree the method before asking for a pass or fail

AATCC TM150-2025 covers garment length and width changes after home laundering. Its public scope includes different washing, agitation and drying options and notes that certain stretch fabrics may fall outside its applicability. Naming the method without its selected conditions therefore leaves important information missing.

Ask your manufacturer or laboratory to identify the appropriate method and edition for the actual hoodie, the selected procedure, sample preparation and number of cycles. For a UK brief, state temperatures in degrees Celsius and measurements in centimetres or millimetres. Record the drying procedure explicitly; do not compare two reports as equivalent merely because both say machine washed.

The public method summary is not the full test procedure. Use a qualified testing provider for a formal result, and label any informal development wash as such. Agree acceptance criteria before reviewing the outcome rather than choosing a convenient threshold afterwards.

Sources: AATCC

Define measurement points another person can repeat

ISO 3759:2011 addresses preparation, marking and measurement of textile specimens and garments for dimensional-change assessment after specified treatments. It is a measurement reference, not by itself a complete washing instruction or a universal acceptable-shrinkage limit.

For your development worksheet, attach a simple garment drawing with named measurement points. Define where body length begins and ends, where chest width is taken, and whether sleeve length includes the cuff. Specify whether a width is measured flat or represents a circumference. Keep the same units, endpoints and garment presentation in both records.

Have the laboratory document any preparation and measurement requirements of the selected method. Keep your commercial size-chart measurements identifiable alongside the formal test results; do not silently treat differently defined measurement points as interchangeable.

Sources: ISO

Use a before-and-after approval worksheet

The following is our suggested record for a hoodie development review. It organises the buying decision and does not replace a laboratory method. Create a separate sheet for each identified specimen and retain the actual report with it.

• Sample identity: style revision, labelled size, colourway, fabric and trim references, decoration state and specimen ID.
• Initial-size decision: target dimensions, agreed size tolerances, actual pre-care measurements and whether the starting sample meets the brief.
• Treatment record: method and edition, selected wash and dry conditions, cycle count, testing provider and report reference.
• Measurement rows: point name and diagram reference, original value, final value, difference in centimetres and signed percentage change.
• Appearance notes: hood shape, body-to-rib relationship and other visible changes, with comparable photographs and no assumed diagnosis.
• After-care decision: agreed limits for each relevant point, results against those limits, outstanding questions and the person approving the identified revision.

Read the numbers without losing the starting-size problem

For a transparent development calculation, signed percentage change equals (final measurement minus original measurement) divided by original measurement, multiplied by 100. A negative result denotes a reduction. Follow the chosen laboratory method for its formal calculation, precision and reporting requirements.

Here is a hypothetical arithmetic example, not a Kylie test or an acceptance limit: a body length of 70.0 cm before care and 68.6 cm afterwards changes by −1.4 cm, or −2%. If chest width changes from 60.0 cm to 60.6 cm, that is +0.6 cm, or +1%. Keep both rows; do not average them into a single description of fit.

Now consider a sample already shorter than your agreed size specification before washing. A small percentage change does not resolve that original sizing issue. Record the initial-size decision separately and request the relevant correction. Equally, a correct starting size does not automatically approve its after-care result.

Close the decision with an identified revision

If a result misses the agreed requirement, ask the production team to investigate the specific material, process and measurement record. Request a revised sample with the changes documented, then repeat the relevant comparison. Avoid simply adding the observed percentage to every pattern measurement without understanding which dimensions and components need attention.

Keep approvals tied to the tested sample configuration. Decide with your supplier whether a later fabric, finish, trim or decoration change requires another review. Do not extend one size or colourway’s evidence to the entire range without an agreed sampling plan.

To discuss a hoodie project with Kylie Industry, send your intended UK market, silhouette drawing, size chart, material preferences and proposed care expectations. Attach the worksheet and ask which sampling and testing arrangements can be provided. Confirm the project’s quantities, price and timing directly before proceeding.

Continue your brief

• Discuss custom hoodie manufacturing
• Separate dimensional change from garment seam twist
• Send your hoodie sample brief