How to Wash Cotton Innerwear So It Lasts
Simple washing and drying rules that keep cotton vests, underwear and socks soft, white and in shape for longer.
By the SFIVA team · 17 September 2026

Good cotton lasts for months when it is washed well — and wears out in weeks when it is not.
Washing
- Wash whites separately from colours.
- Use cold or warm water. Hot water shrinks cotton and tires elastic.
- Turn underwear inside out to protect the waistband.
- Use a mild detergent; skip bleach, which weakens fibres.
Drying
- Line dry in shade. Harsh sun yellows whites and hardens elastic.
- If you tumble dry, use a low setting.
Keeping whites white
Soak white vests for 30 minutes in warm water with a spoon of baking soda before washing once a month.
Socks
Wash inside out, pair them before washing (or use a mesh bag) and replace pairs as a set.
Ironing
Vests can take a warm iron. Never iron elastic waistbands.