Under garments

I didn’t wear anything with my illusion back. Ask your seamstress to sew in cups if they aren’t already there.

I had cups sewn in my dress.

Cups sewn don’t provide lift and support, especially larger than a B cup. But they do pad the nipples. Adding boning will provide lift/support. Otherwise try adhesive bras/tape such as https://www.boobhold.com/

Another vote for cups being put in. You can also tape the boobs a la the Kardashians with paper sports tape if you want to give yourself more cleavage!

They make cups that are actually like real bra pads, push the girls up, and offer plenty of support. (NOT like the thin, flimsy ones in bathing suit!). Ive had them sewn into every formal dress I’ve ever worn, and they do a phenomenal job!

Here’s what they looked like on wedding day and from the inside of dress!

My dress finally came in yesterday and I got to try it on, it has a dramatic back do no bra for me as well. The neck line is also vneck so I'm going with adhesive cups that add lift. My dress is also very form fitting and has open mesh on the sides, so I'm looking into a pencil skirt slip.