Winter Wear.. Do Super-Heroes modify their costumes for the cold?

Spandex and skin tight apparel is hardly winter wear, while I suspect masks help shield wind chill, the same can not be said for skin tight costumes, an example of this was mentioned in a Spider-Man novel, where Spidey wore a 90's style Avengers leather jacket over his costume to help stay warm, though still felt like he was freezing due to the thin fabric of his costume. In general super-hero costumes seem designed for flexibility, not warmth. Any theories on what the heroes do to stay warm during the winter months?

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