World War I boosted the bra market.

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INTERESTING FACT

World War I boosted the bra market. During the First World War, the U.S. War Industries Board asked American women to forgo their corsets—which required significant amounts of metal to construct, according to NPR. Instead, they were expected to switch to the less-demanding bra. The ladies did their part for the cause, freeing up to 28,000 tons of metal—enough to build two battleships—and changing female fashion from that moment forward.