The 11 Best Backless Bras, Tested and Reviewed Yellow Floral Lace Backless Mermaid Long Prom Gown with Slit fg4829 Simple Ivory Satin Mermaid Backless Bridal Shower Dress VQ Pink Wink Lightly Lined Plunge Bra Black Do you have a deep V neckline and a backless dress, but no bra?, Plunge Into Extreme Boost Bra to the rescue! Also, just because you're going low cut or deep v, doesn't mean you have to sacrifice The right bra is the most underrated piece in your wardrobe that can actually make your outfit look better. I just got three from @knix so scroll to see how they compare.