A Slytherin girl is one who will do almost anything to achieve what she wants. Whether that's winning the House Cup or Halloween costume contents, she wants it all. To achieve the latter, all you gotta do is rock this accessory! Perfect for Harry Potter costumes, this skirt comes in Slytherin's green and silver shades. Style on little Miss Ambitious. Polyester. One size fits most. ™/© Warner Bros. Entertainment Inc.