Never seen a vintage piece like this! Absolutely obsessed with it! It is missing one button on the outside fold over, but does not affect the way it fits and is easily replaced. There is an inside button in place.
Waist measures 14" with a 14" rise and 6.5" inseam.
Shown on a size small dress form. I would guess this fits a size 6/8 best but always check the measurements.