Choose a Mitchell & Ness Legacy Jersey for your official NFL throwback. These versatile Jerseys shouldn't be limited to game-day wear, with their tough polyester construction making them perfect for layering whilst being lightweight enough to be worn on their own. First taking the field in 1933 as the Pittsburgh Pirates, the team became the Steelers prior to the 1940 season after a "name-the-team" contest which paid homage to the city's steel mill heritage.