This is a gorgous dress. It's the "Nina" Pleated Dress and comes from Curvaceous Boutique.
The description of the dress is as follows: 60% Polyester, 35% nyon, 5% spandex. This elegant strapless party dress has folded pleats and belted waist for a modern spin on a classic. The hemline falls just above the knee, making this dress a great choice for any occasion.