70s vintage black strappy one shoulder evening gown/prom dress (Small)

70s vintage black one shoulder evening gown. No brand tag but definitely vintage & such a stunning piece! Maxi/floor length dress with an asymmetric, 7-strap detail on one shoulder. Zipper closure on the side. Excellent quality & condition! No stretch, see measurements. ❋ Tag Size: none (fits like a small) ❋ Flaws: none ❋ Material: 100% polyester ❋ Pit to pit - 15.5” ❋ Waist - 13.5” ❋ Hips - 21” ❋ Length - 56” (from top of strap) **clipped on model** ❋ Model: 5’5” | XS/S | 23-24” waist (UK413)