(Again, foundation for a gown under which you cannot or do not want to wear an additional undergarment.
Como hacer un brasier paso a paso #ClippedOnIssuu
Or you could just sew it. diy How To Repair An Underwire bra
Bra hacks: DIY 3 Strap Bra for Backless Tops and Dresses. All you need is: a strapless bra in your size (preferably pick one with boning in the side so it does not collapse on itself.