A garment can look perfect when it leaves the factory and still change noticeably after the first few washes.
A T-shirt may become shorter. A pair of trousers may change in length. A sweatshirt may become wider or narrower.
These changes are related to dimensional stability and fabric shrinkage.
For custom apparel buyers, understanding this issue is important because the finished garment must remain reasonably consistent not only when it is delivered, but also during normal use.
What Is Garment Shrinkage?
Shrinkage is a change in the dimensions of textile material after exposure to conditions such as washing and drying.
The change may occur in:
- garment length
- garment width
- sleeve length
- body length
- waistband dimensions
- overall garment shape
Shrinkage does not necessarily occur evenly.
A garment may shrink more in one direction than another, which can change its proportions.
Why Does Fabric Shrink?
Textile materials can contain stresses introduced during spinning, knitting, weaving, dyeing, finishing and other manufacturing processes.
When the fabric is exposed to moisture, heat, agitation or drying, some of these stresses may be released.
The result can be dimensional change.
Different fiber types and fabric constructions can respond differently to the same washing conditions.
This is one reason why two garments made from visually similar fabrics may not behave identically after washing.
Fabric Shrinkage vs. Garment Shrinkage
It is useful to distinguish between fabric testing and finished-garment performance.
A fabric can be tested before production.
However, the finished garment also contains:
- seams
- hems
- collars
- cuffs
- waistbands
- prints
- embroidery
- different fabric panels
These construction elements can influence the final dimensional behavior.
Therefore, fabric shrinkage data should not automatically be treated as an exact prediction of every finished garment measurement.
How Is Dimensional Change Tested?
AATCC TM135-2025 provides a standardized method for determining dimensional changes in fabrics after home laundering.
The method evaluates changes in length and width after specified laundering procedures. It includes different washing temperatures, agitation cycles and drying procedures.
The basic concept is straightforward:
Measure → Wash → Dry → Measure Again → Calculate Change
The percentage change can then be compared against a buyer’s specification.
Why Washing Conditions Matter
Different washing and drying conditions can produce different results.
For example:
- cold washing
- warm washing
- hot washing
- tumble drying
- line drying
may produce different dimensional changes.
This means that simply saying:
“The fabric has low shrinkage.”
may not provide enough information.
A more useful specification identifies the testing method and conditions.
What Buyers Should Specify
For custom clothing projects, buyers should consider defining:
- acceptable dimensional change
- washing procedure
- drying procedure
- testing method
- fabric construction
- finished-garment measurement requirements
This is particularly useful for products that will be washed frequently.
Which Products Need More Attention?
Shrinkage can be particularly important for:
- T-shirts
- sweatshirts
- hoodies
- cotton uniforms
- workwear
- sportswear
- children’s clothing
- garments sold with specific size specifications
For team apparel, unexpected shrinkage can also affect the relationship between the original size and the customer’s preferred fit.
Pre-Washing and Fabric Treatment
Depending on the product and manufacturing process, factories may use fabric relaxation, pre-shrinking or other finishing approaches to control dimensional changes.
However, these processes should not be treated as a guarantee of zero shrinkage.
The correct approach is to establish an acceptable dimensional-change range and verify it through testing.
What Custom Apparel Buyers Can Ask
Before bulk production, buyers can ask:
- Has the fabric been tested for dimensional change?
- What test method was used?
- What washing and drying conditions were used?
- What is the expected dimensional change?
- Was the actual production fabric tested?
- Does the finished garment have additional measurement requirements?
These questions help turn an uncertain quality issue into a measurable specification.
Our Approach to Custom Apparel
For custom clothing projects where post-wash dimensions are important, we can consider dimensional stability during material selection and product development.
The objective is not simply to make the garment look correct before shipment.
The goal is to make sure the finished product is appropriate for the way customers are expected to wash and use it.
Final Thoughts
Shrinkage is easy to overlook because it may not be visible during a factory inspection.
However, even a relatively small dimensional change can affect garment proportions, fit and customer satisfaction.
For B2B custom apparel buyers, defining washing conditions and dimensional-change requirements before bulk production can help reduce unexpected results after delivery.
