I ride in cotton t-shirts (cut off arms) and cotton underwear under nylon running shorts. Clothes line air overnight or just hang over bike. Good to go, no washing.

IMHO, the outdoor clothing industry has duped many people into believing synthetics are waaaay superior to cotton and into paying 10 to 20 times more for a t-shirt! : facepalm:

In extremely cold weather synthetics have many advantages, but otherwise, they just stink.

On rest days I'll shower with clothes on, or wash them in my bear vault.