Sherri Hill - 8551 - Elegant Evening Dresses
I bought the dress in a Large (which is the biggest size they have it in) and it fits almost perfectly. I have a bigger bust (about 46 inches) so I wasn't very surprised when the top part had a little gap in it.
Source : https://www.introclassy.com/en/sherri-hill/2518-sh
Does this belong to you Or do you know who sells it ?