Kid Yamamoto is one of the top Japanese MMA fighters. Although he lost his recent fight at the DREAM 9: Featherweight Grand Prix event, he definitely looked much more fashionable than his opponent.
Walkout tees are usually full of branding and advertisements for MMA/Medical Supplements/Gambling company graphics. Sometimes, the obligatory dragon or medieval theme graphic is usually placed prominently around the chest for added toughness and grit. A gritty helmet with large horns add to the creativity and toughness.
But Kid Yamamoto took it to the next level by adding some prominent streetwear companies to the mix with his walkout tee. Check out Crooks, RATS, Kicks/HI prominently featured on the back. I wish I could get a hold of one these.