Personalized I Love the WhatIf Monster Youth Long Sleeve T-Shirt. He's anxious, he's pessimistic, he's doubtful, but he's oh-so cute. I Love the WhatIf Monster Youth Long Sleeve T-Shirt - White, 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)