Size guide

Measured flat, in centimetres

Size	Chest width	Back length	Best for
S	52 cm	72 cm	Slimmer frame
M	55 cm	74 cm	Most common fit
L	58 cm	76 cm	Relaxed fit
XL	61 cm	78 cm	Loose summer fit

Relaxed fit, true to size. Between sizes? Take the smaller one.