New Staud Penelope (backless) gown - out of stock elsewhere

Never worn before breathtaking Staud gown (Retail price $495) I'm typically a 2 or 4 and it fits well with a little bagginess up top, but is longer than I expected (goes to lower shins). Could fit someone in sizes 4-8 potentially because it has elastic waist band. Original listing: https://www.shopbop.com/penelope-dress-staud/vp/v=1/1569690567.htm Description: Meet Penelope! The designers at STAUD have rethought the black occasion dress with this silhouette, which captures attention with a gauzy organza overlay and a romantic open-back design. Fabric: Lightweight, non-stretch organza Round neckline Puff sleeves with elastic cuffs Cutout at back Covered elastic at waist Flounce hem Pullover design, no closure Shell: 100% polyester Lined Dry clean Imported, China Style #STAUD30785