I calculated that my next parents' body mass index is 22.4, between 18.5-23.9, which is a standard body type. Now let me tell my parents about the standard size of women's clothes, hoping to help you:

1S 160/84

2M 165/88

3L 170/92

4XL 175/96

If parents buy online, the size of the web page is the size of the tile of clothes, and the human body is three-dimensional, so it needs to vacate 3-5CM space. In view of many years of experience in buying clothes, it is best to wear L size for slim hip skirt, and XL for A-line skirt is very safe.