My friend Pete went to Japan recently and apparently is obsessed with Uniqlo, a company which sells a pretty diverse array of T-shirts in Japan. They don't stop at Japanese licenses-- apparently they had a lot of stuff like Marvel and Lucasfilm too.
This time around he got me a canned (I like the can, I must say) Neon Genesis Evangelion tee. You can see more images here.
I think more companies should sell their T-shirts like LEGO does Bionicle and like Pringles does potato chips. Clearly, a missed opportunity.