Your dress: It has an ultra-deep V-neckline.
The essential: Look for a bra that has a special cutout in the front to accommodate low necklines. Most likely this bra will have extra support on the side (or, in this case, is designed as a bodysuit) to make sure that despite the deep dip, everything stays put.
Dr. Rey Shapewear deep plunge firm control bodysuit, $44, BareNecessities.com
Photo: Courtesy of Bare Necessities