I randomly found this website selling unique, one of a kind, adult tee shirts and baby onsies, tee shirts, and hoodies. I think some are adorable and clever, and worth supporting artists who probably feel pretty lucky to get their artwork on clothing sold to the public. That is the idea of this website, as it supports "awesome designs created and chosen by you." Titled Threadless Tees - Nude No More, I think I might be spending some money here in the future.
Both close ups of designs that eventually are printed out on clothing. Link