Gryffindor Robe Costume - Medium This Harry Potter costume for kids includes a hooded Gryffindor robe with a printed Gryffindor house crest. Our Gryffindor robe comes in child sizes Small, Medium, Large. This Gryffindor robe is an officially licensed Harry Potter costume. The shirt and Harry Potter tie are not included with this kids Gryffindor robe Halloween costume.