So do you think people are going to dress like Rebirth or New 52 Superman in the future? The fact is, every extravagant notion sci-fi artists have about how people will look in the future is usually too over-the-top to ever come true. A modern, sleek Superman suit is no better a prediction of futuristic fashion than this was:
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Why even try? Decades ago, the Superman suit stopped being thought of as futuristic or alien fashion and simply became a pop culture icon. And besides, slapping a stylized belt on Superman just makes him look like every other character that ditched trunks and replaced them with a fancy belt, or characters such as Captain Marvel who had the the caped and trunkless look to begin with.