2013 Sexy Plus Size Halloween Costume Ideas For Women. Top Halloween costume ideas for the curvy girl. Finding the perfect costume for Halloween has never been easier, and this year is filled with selections that can be both scary and sexy at the same time. The most coveted plus size costumes for 2013 include styles ranging from Flapper, to Snow White, A Sexy Witch, Queen of Hearts, Pirate, Polka Dotty, to Batgirl and a Swat Officer. Look below to see more costumes you can wear for Halloween.