The tag is Japan size. US size is for reference only.
Refer to the following measurements.
Garment size
US XXS (JP XS)
Length: 64.5 cm, Soulder width: 41.5 cm, Chest: 100 cm, Sleeve length: 50.5 cm, Inseam: 63.5 cm, Waist: 55 cm
US XS (JP S)
Length: 66 cm, Soulder width: 42.5 cm, Chest: 103 cm, Sleeve length: 51 cm, Inseam: 65 cm, Waist: 58 cm
US S (JP M)
Length: 68 cm, Soulder width: 44 cm, Chest: 108 cm, Sleeve length: 52 cm, Inseam: 67 cm, Waist: 63 cm
US M (JP L)
Length: 70 cm, Soulder width: 45.5 cm, Chest: 113 cm, Sleeve length: 53 cm, Inseam: 69 cm, Waist: 68 cm
US L (JP XL)
Length: 72 cm, Soulder width: 47 cm, Chest: 118 cm, Sleeve length: 54 cm, Inseam: 71 cm, Waist: 73 cm
US XL (JP XXL)
Length: 74 cm, Soulder width: 48.5 cm, Chest: 123 cm, Sleeve length: 55 cm, Inseam: 73 cm, Waist: 78 cm