Take the height of 165-175cm as an example,
S suitable for 45-50KG
M suitable for 50-55KG
L suitable for 55-60KG
XL suitable for 60-65KG
2XL suitable for 65-75KG
3XL suitable for 75-80KG
4XL suitable for 80-90KG
5XL suitable for 90-105KG
6XL suitable for 105-115KG