Those are bra cups underneath? If so, attach the cups together under the bustline and clear around your back with heavy grosgrain ribbon to give yourself some underneath support. I'd also add ribbon down the side of each cup so that the sides attach to the back as well. This ribbon can actually extend from the back, up the side of the cup, around your neck for a halter, down the side of the opposite cup and around the back to join with the main back. Basically, you'd be building a bra underneath the cover with the cups that are already there. Then you can cover the exposed ribbon with trim. to match the rest of the costume.
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