Vintage 60s polka dot with pleated skirt dress

Vintage 60s polka dot dress Ivory polka-dots on navy background on top Fold-over Mock turtleneck Back zipper Sleeveless Pleated ivory skirt Good vintage condition only damage is one light dot of discolor by hem on back Based on measurements I would call this a modern small, as vintage sizing is unavailable Measures 18" across the bust from pit to pit 36" long from shoulder