Vintage Little Black Dress Size 2

Purchased from vintage shop, this little black dress is of indeterminate age, and makes me think of "Breakfast at Tiffany's." Very basic in the front, long side zipper, and much drama in the back where it is low cut with slats of fabric that blouse, contradicting the fitted style. There are no tags, but when you wear it it feels like you are wearing a piece of fashion history. 16 inches pit to pit. 13 inches at waist. 39 inches long