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	33 cm	44 cm	39 cm
M	35 cm	45 cm	40 cm
L	39 cm	47 cm	42 cm
XL	40 cm	48 cm	43 cm
2XL	43 cm	53 cm	44 cm