I wear Free Fly pocket T's regularly; made from bamboo. Soft, comfortable, no wrinkle and , I think you could wear one for a month; though I don't. No odor retention. Free Fly wear is great for traveling light.
$48 for a pocket tee?
Nah Dawg, I'm sweet...
I thought the same thing till I tried their stuff; now I own a lot of it.
They are worth it IMO; and go on sale often and can be found on EBay