If I were a superhero, I wouldn't wear tights, or a unitard or anything like that. I'm thinking sweats or fatigues would be the way to go. Unitards give you wedgies. Tights itch and are hard to get on. When you run in them, you end up with the crotch at about mid-thigh. They get runs in them. Plus panty lines.
I don't buy that close fitting clothes make it easier to fight and climb and run. If it were true, Danskin would have a military contract.
Also, how do superheroes get their uniforms cleaned? Do they have a bunch of them and just toss them all in the wash at once? And who makes them?