*nods* I mean I'll buy some female characters wearing thongs -- because hey some women don't find them uncomfortable or are wearing them for a certain reason (no panty lines, they aren't going to be wearing it long, etc), but Black Widow? Not one of those woman.
I see her wearing boy shorts when she's not wearing her skin tight costume. And when she is wearing skin tight costume, I'd be she's not wearing any underwear because the damn thing has it built in or something.