Statement :you can choose size according to this size excel compare to your most fit pant in these parts, the pant have good elastic thanks

S size :  1.68m--1.74m

59KG--66KG

M size:  1.70M--1.78M

68KG--80KG

L size:   1.76M--1.83M

80KG--90KG

XL size:  1.80M--1.85M

85KG--95KG

XXL size:  1.82M--1.90M

100KG-108KG

XXXL size: 1.83M--1.90M

110KG

(Then refer to waist circumference to choose a size)