How can i keep my from bouncing around when i am dancing.?

I am a competition dancer and i have big s for a dancer. All my costumes keep slipping down and my teacher just told us that our leotards can not show AT ALL. Most of the other girls can simply slip on the sticky but me and one other have big s and don't know what to do. If we use the sticky it will not hold our s all in and together. Any ideas.??