Anything next to the skin (t shirts, underwear, socks etc) ...every day.
Trousers (although they're next to the skin) 2 or 3 days if they dont get dirty, same with jumpers. But then, i'm not wearing them for say 2 or 3 days solid, i tend to wear something for a few hours a day then air or fold them up if still clean.
I remember completely doing my kitchen, 4 days solid work, decorating, new units, plumbing, carpets, the lot. I decided i'd just wear the same stuff (barring underwear and socks) for the duration. Jesus H Christ, it (i) stunk by the end of it.
