The tag is Japan size. US size is for reference only.
Refer to the following measurements.
Garment size
US XXS (JP XS)
Length: 58.5 cm, Chest: 107 cm, Inseam: 63.5 cm, Waist: 55 cm
US XS (JP S)
Length: 60 cm, Chest: 110 cm, Inseam: 65 cm, Waist: 58 cm
US S (JP M)
Length: 62 cm, Chest: 115 cm, Inseam: 67 cm, Waist: 63 cm
US M (JP L)
Length: 64 cm, Chest: 120 cm, Inseam: 69 cm, Waist: 68 cm
US L (JP XL)
Length: 66 cm, Chest: 125 cm, Inseam: 71 cm, Waist: 73 cm
US XL (JP XXL)
Length: 68 cm, Chest: 130 cm, Inseam: 73 cm, Waist: 78 cm