Slit purple long with gem stones party dress

Never used, hung in storage for the last few years so selling as like new. Length in photos, has stretch and is backless except for a strap that stretches! Tag is missing so I'm not sure on the exact size and brand but I do know I wear all Medium stuff in things like this. I still fit it pretty well so. Pretty sure I got it at the boutique I shop at frequently and would bet it is Dreamgirl brand.