For a tighter, fitter feel we recommend dropped a size down. Opt for a size larger if you prefer a more relaxed and oversized cut. 

Measure around your fullest part, with the measuring tape under your armpits, making sure the tape is flat across your back. 
Measure around your natural waistline - which is the soft squidgy part just under your ribs.

2XS
Chest: 81-86cm / 32-34"
Waist: 66-71cm / 26-28"
XS Chest: 86-91cm / 34-36"
Waist: 71-76cm / 28-30"
S Chest: 91-96cm / 36-38"
Waist: 76-81cm / 30-32"
M Chest: 96-101cm / 38-40"
Waist: 81-86cm / 32-34"
L Chest: 101-106cm / 40-42"
Waist: 86-91cm / 34-36"
XL Chest: 106-111cm / 42-44"
Waist: 91-96cm / 36-38"
2XL Chest: 111-119cm / 44-47"
Waist: 96-104cm / 38-41"
3XL Chest: 119-127cm / 47-50"
Waist: 104-112cm / 41-44"
4XL Chest: 127-135cm / 50-53"
Waist: 112-120cm / 44-47"