Davids bridal size 20 black long gown, new with tags

Size 20 but fits size 16-18, I’m a 44DD and have a 35” waist, never worn, I’m 5’6 and dress was altered to wear 2.5-3” heels, unfortunately alterations took too long so I had to find another dress for occasion, there are 2 straps in the back, one satin sash and one strap across the bra line, both can be unbuttoned to put the dress on, selling for less than half of what I paid