The Vest is measured in what is called "free size" in Japan meaning that it is constructed to fit many different sizes of women, including large sizes.
(Just to give you an idea of the size..... I put on this vest. I have a 40 inch waste and I'm 41 inches around the chest. The vest fitted me just fine.)
height: 5 ft 4 inches, 163 cm
Weight: 110 lbs, 50 kg