What slim fit means and who it suits
Short answer: Slim fit lies closer to the body than regular. It is cut narrower at the waist and in the sleeve, and it is a shape rather than a size.
Narrower all the way
Slim fit is not just a size smaller. It is cut differently, typically narrower at the waist and with a tighter sleeve. See bamboo T-shirts for men.
Not the same as a smaller size
Go a size down in regular and everything gets smaller, including the length. Slim fit keeps the length and narrows only the width.
Fabric with stretch makes the difference
A slim fit without stretch limits movement. With a few percent elastane it sits close without pulling. See bamboo T-shirt for women.
When slim fit does not work
If the fabric pulls in horizontal lines across the chest or stomach, it is too small. Then you need to go up a size or over to regular.
Shrinkage hits hardest
A slim fit piece that shrinks becomes unusable faster than a regular one. Wash at 40 degrees. See washing and care.
Frequently asked questions
Is slim fit the same as a size smaller?
No. Slim fit is cut narrower but keeps the length.
How do I know if slim fit is too small?
If the fabric pulls in horizontal lines across the chest or stomach.
Does slim fit need stretch in the fabric?
It works much better with a few percent elastane.