@Zoro D Goat I thought you lived in Vietnam?
Anyways, try being an American woman and buying clothes. There is zero logic in pant size, shirt size, or dress size. I have an extra small shirt that is massive on me. Yet a medium t-shirt that fits fine. Then pants aren't measured by waist size. It's 0-22 (maybe higher?) Each company has different size regulations. I can have jeans that range from 4-8 but they look to be about the same size. Then length is just petite, regular, or tall.
Anyways you probably don't care but Americans can barely follow any measurement system.