Strapless Long gown/dress with back zipper

Strapless evening dress. Some gathering at waist. Small padding in the front for slight breast support. Rubber lining to keep top in place. Back zipper under ruffled material. Back slit 22 inches. Full length of dress 55 inches. Zipper stitching coming undone about 1 inch but easy fix (see pic). Worn one night.