Women's Sexy School Girl Costume - Calgary, Alberta. This School Girl costume is great for your significant other or Halloween. eacher's pet? Most definitely in this sexy School Girl costume. This School Girl costume includes a nylon like red plaid skirt with an elastic waist. The second part is a white t-shirt made of a nylon like material. It is short to just below the chest and ties in the front. The collar is trimmed in the matching red plaid.