How Often Should You Replace Your Underwear and Vests?
Signs your innerwear needs replacing, how long cotton vests and underwear really last, and a simple routine to keep them fresh.
By the SFIVA team · 24 September 2026

Innerwear works harder than anything else in your wardrobe: worn all day, washed constantly. Here is when to let it go.
The signs
- The waistband has lost its grip or rolls over.
- The neckline of your vest curls or has stretched open.
- Thin patches, holes or pilling appear.
- Whites stay grey or yellow after washing.
- It no longer feels comfortable.
How long it lasts
With a fair rotation — seven to ten pieces worn in turn — good cotton innerwear usually looks and feels right for six months to a year. Buying in packs keeps the rotation even, so pieces wear out together and you replace them together.
Make it last longer
- Wash cold or warm, never hot.
- Skip bleach; it weakens cotton fibres.
- Dry in shade — strong sun yellows whites and hardens elastic.
- Do not iron elastic waistbands.
A simple rule
New year, new drawer — and again mid-year, before summer. A pack of six vests and six underwear covers the whole cycle.