Zac Posen full-length sequined gown, low back with purple velvet straps

Zac Posen sequined gown- purple velvet shoulder straps which close in the back. Dress has square open back where velvet straps tie in bows. exquisite hand-sequin detailing- silver, purple and turquoise sequin pattern on silk. Full length skirt is pleated (when sequin pleats open you can see sheer silk beneath). hidden zipper closure on lower back never worn, attached tag. very long. size 4 (dress has some give).