" All over America, you see women in yoga pants and men in sweatpants, even when they are not on their way to or from a yoga class or softball field. When I fly, I see so many sweat suits – even pajamas – on my fellow travelers that it’s as though the airplane were the sleeper car of a train bound for summer camp or a gym in the sky, not a public space for business people and vacationers. "

― , Tim Gunn's Fashion Bible: The Fascinating History of Everything in Your Closet