|"I am not a monster."|
Right, you had a question about Wally. Team mascots are trademarks (or trade dress) of sports teams. They may be federally registered (as is Wally the Green Monster) but registration is not required to claim trademark rights. In any case, we don't imagine you'll be hearing from Red Sox lawyers over your onesie, as professional teams tend to aim their guns at offensive uses or high-profile merchandisers.