The Sooners are in the Big 12 Championship, so be sure to check out our selection of Oklahoma Big 12 Championship shirts and more from our shop. Make sure you have all the best Oklahoma gear this season and pick up a stylish Oklahoma T-shirt here at the NCAA Shop, the official store of the NCAA. The NCAA Shop carries sizes for men, women, and youth so every Oklahoma fan is covered. Choose from a variety of styles including Oklahoma short sleeve T-shirts, long sleeve tees, tank tops, and more. Visit the NCAA Shop for all your Oklahoma T-shirt needs.