If beached hotdog legs were for summer 2014, then thighbrows—a set of folds that frames the tops of thighs and separates leg from butt—are the erogenous zone of 2015. Thank the frong for a new—perhaps more attainable—thigh moment. I know what you're thinking: It's the first day of New York Fashion Week. It's fall for fuck's sake. Why are we talking about thighbrows? Because frongs are evergreen. Just look at frong-mother Beyoncé. Here, seven thighbrow pioneers free the fold, beachside and beyond.