Anna Spaghetti Strap Cocktail Dress, No Size Tags (S/M?)

Preowned, great condition; very small stain at the very top of the front of the dress. Estimated as a size S-M since original size tags have been removed. Perfect cocktail dress featuring spaghetti straps and a white floral design on a black background. Dress is not see-through; under layer is black, top layer is sheer with the printed pattern. Approximate measurements with the item laying flat are as follows: Waist - 19" (slight stretch) Pit to pit - 17" (slight stretch) Length - 33" Hips - 21" (slight stretch) Width at bottom - 25½"