Personalized Whatif Monster Birthday Girl Women's Plus Size T-Shirt. There's no day like your birthday, so why not try something new? Whatif Monster Birthday Girl Women's Plus Size T-Shirt - White, perfect for little fans of "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40 combed ringspun cotton/polyester)