Retro Vintage pin up look sheer polka dot Feminine Ruffles blouse Medium Large

The piece is just freaking adorable!! it's says Medium Large on tag. Unknown fabric because it in a foreign language, but I believe it to be 100 percent polyester. Measures armpit to armpit 20" across, and 20" long approximately. It's meant to wear over camisole or maybe added to that little black dress.