Spandex vs Regular wear
"Spandex" (the catch-all term for form-fitting attire) has been pretty much the traditional garb of superheroes (especially Western-style) since the beginning of the superhero genre (unfortunately, while it looks great in comics, men in spandex do not seem to translate well to live-action).
Two alternatives to spandex have been...
1. The "natural" look, ie, no formal, fancy costume. What you see is what you get. Examples: Surfer, Hulk.
2. Regular clothing, from traditional garb (eg, DBZ), to street clothes (Superboy, with his tee and jeans), to leather or even paramilitary (movie X-men).
What are your preferences and why? Should superheroes stay with muscle-/curve-showcasing spandex? Is regular clothing better because it's more realistic? But if a character dons regular clothes, does that somehow detract from his/her superheroness (after all, shouldn't a superhero look like a superhero)?