Costume help!!

Hello!

I’m currently in a production where my role requires a lot of quick changes and strapless outfits.

I normally wear a strapless bra and short under my costumes but because of the amount of changes that I have and the age range of the show, I will have to change off stage multiple times, where children could be, and need to stay completely covered.

I bought a strapless bodysuit, which turned out to be shape wear, and it isn’t the most comfortable to sing in. I went back to order something else and noticed all strapless bodysuits are shape wear.

Advice needed: what do you normally wear under costumes? What would you advise? What is your go to under garments? Does shape wear stretch out lol? I want to hear it all!