Use the chart below to determine your size. 
Please know that we are using Italian sizes which means that you should most likely size up.

FOR MEN:
If your waist, chest and height dictate different sizes, opt for the size as defined by your waist, then your chest. Your height is the least essential determinant.

Size Chest Waist (Height)
2XS 78-82 66-70  162-168
XS 82-86 70-74 165-173
S 86-91 74-78 170-178
M 91-95 78-82 173-181
L 95-99 82-86 176-184
XL 99-103 86-90 179-187
2XL 103-107 90-94 182-190
3XL 107-111 94-98 185-193
4XL 111-115 98-102 188-196

 
FOR WOMEN:
If your waist, chest and height dictate different sizes, opt for the size as defined by your chest, then your waist. Your height is the least essential determinant.

Size Chest Waist (Height)
XS 78-82 62-65 160-165
S 83-87 66-70 164-169
M 88-95 71-75 167-171
L 96-103 76-80 168-172
XL 104-110 81-85 170-175
2XL 111-118 86-90 174-180