In the Mens Jackets most of the coats are a normal fitting ie:

S - 38
M - 40
L - 42

FOR BIKER STYLE JACKETS PLEASE ORDER THE SIZE ABOVE.

In the ladies styles most are normal ie

08 -XS,
10 - S,
12 - M etc

except the zip jackets which tend to be small so you need to size up 1 size. 

The fashion jacets are very small fitting so size it 2 sizes up.

The flying jackets are normal fitting