The tag is Japan size. US size is for reference only.
Refer to the following measurements.
US XS (JP S)
Waist: 70 cm, Hip: 113.5 cm, Front rize: 29.5 cm, Inseam: 18 cm
US S (JP M)
Waist: 75 cm, Hip: 118.5 cm, Front rize: 30.5 cm, Inseam: 18.5 cm
US M (JP L)
Waist: 80 cm, Hip: 123.5 cm, Front rize: 31.5 cm, Inseam: 19 cm
US L (JP XL)
Waist: 88 cm, Hip: 131.5 cm, Front rize: 32.5 cm, Inseam: 20 cm