Love them or hate them, leggings—often criticized as a 2010s fashion faux pas—are undeniably trending. (Not to be confused with tights, leggings end at the ankle!). Dating back to the 14th century, they gained popularity in the late 1950s when chemist Joseph Shivers invented the first Lycra pair. By the ’80s, leggings took on a bold edge, like Olivia Newton-John’s…
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