The return of the tracksuit is only further proof that the athleisure trend has hit new levels. Taking style tips that are more footballer and less Tony Soprano, more guys are opting for the cozy two-piece suit than they have in recent years. adidas first introduced the tracksuit as athletic wear in 1964, before it became a fashion staple in the ’70s. In 2016, you’ll probably see dudes trying to rock this look to work.