Black sparkly dress. Halloween costume.

Long sparkly black and gold dress thing with bottoms. Says it's a medium. No name brand. I'm 5'2 and holding it up to me touches the ground. Bought it off of some website but it looked nothing like the picture so it's been sitting with my Halloween costumes since. I tried to find the website/listing where I originally purchased it for more information but haven't had any luck. Will update if I do!