Well it depends on the super power really, if you're talking super speed you're going to want to wear something designed for sports and aerodynamic. Could you imagine the friction burns otherwise? Not to mention how quickly you'd wear through something like suit trousers or jeans. Be constantly having to buy/steal new jeans/trousers to put on because your nuts would be hanging out.

If you're talking about something like Wolverine's healing + adamantium claws and bone coverings then I would probably wear something really hard wearing, you're going to get in to scrapes and scraps so Leather would probably be quite key to this leather, denim and other tough clothing materials.

If you're talking about telekinesis or something then really anything goes, a suit would probably be quite awesome at this point to simply walk around like a boss throwing trout at people with nothing but the power of your mind. Though you could also want to have a tough wearing outfit for when you're going in to a more rugged/dangerous situation.

If we're talking something similar to the Human Torches power then well, I'd hope to have something, anything I could wear which wouldn't burn straight off my skin leaving me naked when I "flamed on"