I wear the same stuff I've been wearing the last few days until about mid-trip. I may take off an over-shirt at camp or add some fleece if I get chilly but then again my shirts are all cotton. ;)   I think you guys are way too hard on cotton. Thick, like jeans and sweatshirts I agree but light cotton shirts? If mine get wet I'm wearing 'em until they dry. I did that on cold pre-season trips too. I learned the hard way that heat is need to dry things on about the third day of a windy bone chilling drizzle with nothing dry left to wear. Always have a dry set of clothes just in case.

I'll wash socks on occasion but I only washed a shirt once. I wasn't pleased with the results. I'd rather carry an extra one than do laundry on vacation anyway. I have stopped bothering with a second pr of pants in summer. Cold weather I'd consider it but rain pants and long-johns work too. No need to sleep in the rain pants.

Never heard of bamboo clothing before. Sounds interesting.