This is a 3pc. Dress, Jacket, Belt. There are several light stains that are hard to see from a distance (please refer to photos with white pointer). Dress would still be great for any occasion. It appears as though the tag states the piece is a 8S, however vintage sizing is hard. Based off of measurements piece is more a size small. 

PLEASE REFER TO ALL PHOTOS FOR QUALITY AND MEASUREMENTS. PIECE IS VINTAGE AND SIZING MAY NOT BE ORDINARY.