I love this! Layla Cutout Ruffle Dress in Black.
"The Layla Cutout Ruffle Dress is fully lined and is made of a fluid chiffon-like fabric you’ll love! It has a V neckline with a pleated ruffle that continues around to the back of the dress. On each side of the dress is a flirty fabric cutout that manages to be sexy yet sophisticated. The fluid skirt flares out and will float and flutter as you walk by. A low back with an invisible back zipper completes this great look."
From http://www.lilyboutique.com