Size :
Similar to clothes : For AdvancedSkin bags, just take the same size as your T-shirts.
XS: Chest size: 84 - 89 cm
S: chest circumference: 88.5 - 96 cm
M: chest circumference: 95,5 - 102,5 cm
L: Chest size: 101,5 - 108,5 cm
XL: chest size: 108 - 115 cm