A plunging back goes deep at the back with an equally deep or deeper plunge than the front. The back exposure matches or exceeds the front exposure which creates symmetrical drama. Plunging back dresses work because the exposure is significant and coordinated on both sides. These dresses need excellent fit because the deep back means everything is visible and everything matters. The fabric should be stable enough to hold the deep back without gaping. Plunging back dresses read as evening wear and require the right undergarments and confidence. The silhouette should be relatively fitted because loose fabric on a plunging back reads costume-y rather than elegant. A plunging back dress works for someone who wants significant exposure without the fully backless commitment. These are the plunging back dresses that work because the deep back creates impact that is dramatic and intentional.