1S 160/84
2M 165/88
3L 170/92
4XL 175/96
If parents buy online, because the size on the web page is the size of the tile of clothes, and the human body is three-dimensional, so leave 3-5CM space. One of my colleagues is 168CM in height and 145 kg in weight. When shopping online, it is just right to choose XXXL, so I suggest your mother choose XXL.