These are Harry Potter Pajama Union Suits! These Harry Potter One-Piece Pajama outfits are made of super-soft fleece fabric. You can choose from the 4 Hogwarts School of Witchcraft and Wizardry house designs:. Each one-piece union suit features a solid black color base with a hoodie and sleeve and leg cuffs, which are the house colors of your choice, with an embroidered house crest logo on the left chest. The union suits have a full crotch to the neck zipper closure. Each pajama outfit is made of top-notch, ultra-soft fleece that is 100% polyester. For questions regarding sizing, please refer to the size chart.