Lululemon’s yoga pants may be sheer (whoops), but its coattails are long. Sixteen years after the company invented luxury workout gear, active wear has taken the fashion industry by storm, combining sporty street style with I-woke-up-like-this charm. These days, designers from Tory Burch to Betsey Johnson are creating leggings, sweatshirts, and more, all of them equally welcome on the court and on the town.