Here is a free ballerina costume at Props Guild: http://www.propsguild.com/thumbs/clothes/index.htm but it's in 3ds format and of course isn't conforming or anything nice like that. If you have the 25.00 to spare, I'd say buy Neftis' ballerina. She is really worth it and is just gorgeous. I bought her earlier today and have been making images with her all day long.