Why does Superman wear his Underwear on the outside?

Why does Superman wear the underpants on the outside? - Quora

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Why does Superman wear his underwear on the outside? : r/NoStupidQuestions

Why does Superman wear the underpants on the outside? - Quora

Superman will find his red underwear in Action Comics #1000 - Polygon

Secrets of Superman's Underwear by techgnotic on DeviantArt

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Secrets of Superman's Underwear by techgnotic on DeviantArt