Cute sexy halloween costume ideas. Character Theme. These sexy Halloween costume ideas will flaunt your figure while making you feel like a full-blown supermodel. Plus, it adds a hint of color to your ensemble so your costume will really pop when you're out on the dance floor! Thanks so much! Nora likes a lot of girly things. We absolutely love the idea of making beloved fairy tales characters a little bit more suggestive and that's exactly what this costume does. Jewelry is also a must for anyone wanting to make their outfit unique. Wear Opaque Tights There's nothing worse than wearing the sexy costume of your dreams, but having legs that are ice-cold. Sexy Catsuit Wearing a catsuit by itself, without adding any extra flair or accessories, is an easy way to have one of the sexiest Halloween costumes for secret apartment sex.