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.

Smooth Boost Plunge Bra

Bra-making Sew Along: Band & Cup Construction • Cloth Habit

Gel Demi Bra Cups Oliverio's Bridal and Prom Boutique Clarksburg

Open Back & Backless Wedding Dress Styles of 2024 + FAQs

Gives a great lift and solves the problem of which bra to wear with backless or very low back dresses etc. Do not dry clean. A/B cup, B/C cup, C/D cup

MULTI-PACK of PUSH UP Sew in Bra Cups - Perfect for Dress-Makers or Bridal Shops

How to Sew Bra Cups into Dresses

Open Back Bra. Wrap Around Backless Halter Bralette – Tatiana's

How to Add Cups to the Parker Corset - Free Sewing Pattern

Undergarments: The Official Wedding Dress Guide

How to Sew Bra Cups into Dresses

How To Add A Built-In Bra To Clothing - A Beautiful Mess