Prestige Slytherin Costume Robe for Boys and Girls - This authentic Slytherin Costume Robe is a fully satin lined deluxe black velvet robe with raised embroidered emblem and deluxe clasp. Whether you want to be Draco Malfoy or simply belong to a house of purebloods, this officially licensed, Harry Potter Slytherin Costume Robe will do the trick! Hogwarts School for Witches and Warlocks is divided into four houses.á The house of Slytherin is named for its founder Salazar Slytherin and the students of this house share dormitories and classes. 100% polyester exclusive of trim. 100% polyester.