Halloween costume with leotard?

i'm a freshman in college, and i used to dance, so i have A TON of ballet leotards in various colors (purple, brown, black, navy, dark pink, lime green at least), tutus, soffe shorts, small black skirts, tights in pink, black, tan, fishnet, red/black stripe and highlighter yellowgreen/black stripe. i'd like to be something relatively y, but not all out slutty and hooker-ish. i'm 5'1", skinny and tiny--(i look like a pro ballerina to give u an idea lol) and have dirty blonde/red/brown hair. also i have lots of little accessories like belts, gloves, etc. i was thinking ballerina, cheerleader, flapper, or lady gaga. your opinions on these or any other ideas would be great. thanks!