The best way to measure your correct size is to compare it to a similar garment you already own.
All measurements in centimeter.

Size Chest Length Sleeve
S 51 cm 63 cm 59 cm
M 53 cm 65 cm 60 cm
L 56 cm 67 cm 61 cm
XL 58 cm 70 cm 61 cm
2XL 60 cm 72 cm 63 cm