Personalized What If It's the Best Summer Yet? Youth Long Sleeve T-Shirt. Make every summer the "best summer" with What If It's the Best Summer Yet? Youth Long Sleeve T-Shirt - White, featuring Jonathan James from "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)