Home Adults Sexy Costumes Schoolgirls. Sexy schoolgirls may be the flight of fancy for all kinds of people but their uniforms are a fantasy for many so if you are looking for a daring dress-up idea then our Sexy schoolgirl Halloween costumes will score straight A's. Take the catholic school girl gone bad look. Short plaid skirt, tied-open button up shirt, and long black stockings and heels; this is as hot as it gets. Maybe you want something a little more revealing.