It was a sad day for many a lady with a penchant for footless black tights when the summer ended. Almost in unison, the fashion industry decided that leggings were dead. But not to worry: Our sources in London report that while thin leggings are officially over, the "tregging"—a more robust, thicker fabric version of the beloved original, like a pair of trousers crossed with leggings—is working its way into the most stylish fall wardrobes (think Kate Moss, in her PVC pair, and Mary-Kate Olsen, who developed a black and gray leather pair for The Row, the line she designs with her sister). Moreover, treggings are snag-resistant and versatile enough to go with everything from vintage tees to bustiers (again, see Moss and Olsen for visual tips). While perhaps a bit awkward to say at first, they're an excellent way to cope with legging withdrawal.
—Derek Blasberg