How is it measured?

Neck circumference : measure around the base of the neck, inserting an index finger between the tape measure and the neck to allow for a more comfortable fit to wear.
Chest : measure around the chest at its maximum circumference, the correct position of the measuring tape is just under the arms
Shoulders : measure at the maximum width from one shoulder to the other, measured from the back.

In between one size and another?
If your measurements are in between sizes in the chart, choose the larger size

All measurements are expressed in cm

CUT IT CIRCUMF. NECK CHEST SHOULDERS
15 - XS 40 93-95 42.5-43.5
15 1/2 - St 41 96-98 43.5-44.5
15 3/4 - M 42 99-101 44.5-45
16 - L 43 102-104 45-46
16 1/2 - XL 44 105-107 46 -47.5
17 - XL 45 107-110 48 -49.5
17 1/2 - XXXL 46 110-113 49.5-50.5