As we continue to spot model after model in this latest iteration of athleisure, it has become increasingly apparent that sweats and the tracksuit are the new must-have items. The latest supermodel to step out in the trend is, of course, Gigi Hadid—one of the trend's biggest proponents. This time, however, it was more than just track pants or a cool sweatshirt. She stepped out this week in a head-to-toe sweat suit. It looks like a classic Dad-on-a-Saturday-in-a-Champion-sweat-suit kind of situation, but this particular set is so much cooler than that. It's a luxurious silk-cashmere set from Olivia von Halle, a major authority on elegant leisure wear. Plus, opting for some statement cat-eye sunnies and a floor-sweeping duster coat make a big difference in the styling department. All in all, this a seriously luxurious take on a casual trend that we are so here for.