Please note that this is a guide only and that sizes vary from brand to brand.
International Chest (cm) Chest (inch)
XXS 82-85  32-33 
XS 87-90  34-35 
S 92-95  36-37 
M 97-100  38-39 
L 102-105  40-41 
XL 107-110  42-43 
2XL 112-115  44-45 
3XL 117-120  46-47
4XL 122-125  48-49 
5XL  127-130  50-51 
6XL 132-135  52-53 
7XL  137-140  54-55 
8XL  142-145  56-57