Mikael Aghal Navy Velvet Mockneck Dress 6

On sale is a Mikael Aghal Navy Blue Velvet Mockneck Long Sleeve Dress in a US 6. It is in great, used condition except for a small mark near the hem on the back of the dress (pictured). I couldn't find a material tag but the dress feels like silk. The measurements are approximations Length (Shoulder to hem)- 40.5 inches Width (Pit to pit)- 18 inches