Baman got his logo t-shirt from a novelty store, XXXL, which is what it has to be to fit over the extra ceramic plates, which are in turn over a normal kevlar vest, attached with duct tape. The taped plates are pretty sticky and painful to remove. You endure such things, as a superhero.
A superhero whose name is spelled differently than other superheroes and thus cannot possibly be trademark infringement.
Later the real Batman catches him and dangles him off a rooftop. “Why are you doing this?” he growls.
“You wanna go to a movie?” he says.