Shrink-to-fit
Shrink-to-fit is the idea of washing unsanforized, unwashed denim to shrink it and let it conform to the wearer’s body and preferred size.
Contents6 sections
Definition and Overview
Shrink-to-fit is a specification and concept mainly used for cotton denim. It does not pre-shrink the fabric or product sufficiently in advance, and instead uses shrinkage from washing after purchase or after sewing to change dimensions and texture.
Characteristics
In the unwashed state, denim tends to show its distinctive stiffness, body, and deep color, and the fabric softens as washing and wear are repeated. Another characteristic is that fading and puckering are likely to appear along wrinkles created by body movement.
The degree and direction of shrinkage vary depending on the cotton blend ratio, weave density, finishing process, and washing conditions. Because shrinkage may also differ between the lengthwise and widthwise directions, the finished dimensions are not fixed.
Main Applications
It is used for jeans, as well as denim jackets, work pants, and overalls. It is suitable for casual wear that makes use of changes in the fabric and aging variations unique to each wearer as part of the design.
With thick, stiff denim, it is often used for fall and winter pants and outerwear, but depending on the fabric weight and blend ratio, it can also be used for year-round items.
Selection and Handling Notes
During planning, the pattern and grading should be considered based not only on the pre-wash dimensions but also on the intended post-wash dimensions. Conduct a water soak on the fabric swatch, and then set the material allowance and dimensional tolerance after checking the shrinkage rate, bias distortion, and color fading in both warp and weft.
When washing after sewing, attention must also be paid to the wash resistance and shrinkage differences of the sewing thread, interfacing, and trims. If shrinkage differs by component, it may lead to puckering, twisting, or waviness.
For home care, dimensions and color will change depending on the washing method. For the first wash, wash separately to avoid color transfer. A tumble dryer may increase shrinkage, so it is important to follow the product’s care label.
- Perform a trial wash in advance and record the actual dimensions after washing.
- Stabilize the fabric before cutting and check for grain distortion.
- Assume color transfer and be careful when pairing with light-colored clothing or bags.
Differences from Similar Terms
Rigid generally refers to denim that has not been washed, or is in a state close to unwashed. Shrink-to-fit is the idea of actively using the shrinkage that occurs in this unwashed state to adjust the size and change how it wears.
Sanforization is a process used to reduce dimensional change after washing. Its purpose is opposite to shrink-to-fit, but the actual amount of shrinkage depends on the processing conditions of each fabric, so the shrinkage rate cannot be judged by the name alone.
Frequently Asked Questions
How much does shrink-to-fit denim shrink?
The amount of shrinkage varies depending on the cotton blend ratio, weave, finishing process, water temperature, drying method, and other factors, so it cannot be stated uniformly. Before mass production or purchase, it is necessary to perform a trial wash on the fabric or product and check the measured dimensions in both length and width.
Are shrink-to-fit and rigid denim the same?
They are not completely synonymous. Rigid often refers to the unwashed state of denim, while shrink-to-fit refers to a specification or concept that uses washing shrinkage to make the dimensions conform.
Is water soaking necessary before sewing?
If you want the post-wash dimensions to be stable, water soaking or a trial wash is effective. However, in a plan that aims to shrink the product so it conforms to the wearer, it may be assumed that washing will be done in the finished product state. Clearly define the reference dimensions and washing conditions in the specification sheet.
