No wardrobe is complete without a casual-chic tracksuit. If you're looking to exude effortless class with a modern twist, throw on the adidas by Stella McCartney track pants. These track pants add a fashionable edge with the bootcut and full-length zipper on the front leg. These two features allow you to slip on the track pants over anything you're wearing without changing. Just jump into the pants, zip them up, and you're good to go. Finish your luxe loungewear look by pairing the pants with the oversized track top.