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> The Olympic outfits are only really designed to be used for maybe an hour, and requires maximum performance during that hour. So they're often tailored to the specific needs for the specific event and the specific environment.
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> In other words, it's hot and humid in Beijing, so the athletes wear as little as possible to avoid exhaustion and dehydration for as long as possible.
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> Superheroes, on the other hand, have one costume (or maybe several variations or copies of it) that must be used no matter what the environment is like. Cold, hot, rainy, dry, etc. They wouldn't have the choice of changing into one specifically made for the circumstances (except Fashion Accessory, maybe). So they need one, or maybe two if you want to go seasonal, that can be used in all conditions.
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Again, environmental needs only come into play for characters that are affected by such things. When someone like She-Hulk, Warbird or Wonder Woman can hang out in space, it's hard to believe they're worried about the weather.
My point is that, removed from actual protective needs (many events in the Olympics are in climate controlled environments) most athletes opt to wear less rather than more. I see no reason why that wouldn't carry over to heroes who also don't need to worry about those needs.