Cups sewn into dress or plunging back bra?

Does anyone have any experience with cups sewn into their dress or with a plunging-back bra? My dress is too low-cut in the back for a regular strapless bra (see below), Page 2.

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Cups sewn into dress or plunging back bra?

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Looking for opinions on what bra to wear with my wedding dress

Cups sewn into dress or plunging back bra?

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