Personalized Happy Pi Day Math Holiday Long Sleeve Creeper. Pi Day Long Sleeve Creeper - Light Blue has cute baked pie filled with math symbols. Fun shirt for students or teachers on Pi Day. For chillier weather, dress baby in this soft long sleeve creeper in a great fitting 1x1 baby rib. 5.0 oz., 100% combed ringspun cotton, 1x1 baby rib. White is sewn with 100% cotton thread, Flatlock seams, Double-needle stitched rib binding on neck, shoulders, sleeves and leg openings,Reinforced three-snap closure on binding.