Some true believers also have a sense of humor about reading superhero comics because, well, muscular men in tights and capes. Also most comic book consumers are grown-ass men. Therefore:
That's right, bunkie, it's a t-shirt.
Mighty Fine does other pop-culture tees too but we've a particular affinity for their Marvel line, which has some serious and some silly depictions, but digs fairly deep into the character well too. Where's the company credit card ...
[Post script: Does Daniel Dumile know about this?]