Stella McCartney Is Making The Best Damn Athleisure Out There

For Stella McCartney, a sustainable, ethically conscious, eco-minded ethos is just as important as the design itself. Her 15-year-old namesake label refers to itself as "the world's first and only vegetarian luxury brand," producing high-end alternatives to fabrics like leather and fur; McCartney herself grew up on a farm in the English countryside and has adhered to an animal-free diet since childhood (she also tells Refinery29 that she exercises "six times a week"; and her now 12-year-long wom...