Dress White Lace Formal Prom gorgeous

This beautiful dress was worn one time has been freshly laundered and is in very fine condition. It has one shoulder strap. This is one of the most beautiful pieces in my closet. Armpit to armpit 16 inches. Shoulder to hem is approximately35 inches. The tag reads size 5. I am not sure if this is supposed to be juniors size 5 so please adhere to the measurements