To measure the sizes of shirts, sweatshirts and Hoodies, put the tape measure horizontally on the largest point of your chest and measure along the back. Advice is to take the T-Shirts one size larger than normal. 

Shirts

Height Width Sleeve length
S 68 cm 49 cm 19,5 cm
M 71 cm 52 cm 20,5 cm
L 72 cm 55 cm 21,5 cm
XL 75 cm 58 cm 21,5 cm
2XL 77 cm 61 cm 22,5 cm
3XL 79 cm 64 cm 23,5 cm
4XL 81 cm 69 cm 23,5 cm

 

Sweatshirts & Hoodies

Height Width Sleeve length
S 67 cm 51,5 cm 63 cm
M 71 cm 54 cm 64,5 cm
L 73 cm 57 cm 66 cm
XL 75 cm 60 cm 67,5 cm
2XL 77 cm 63 cm 68 cm
3XL 79 cm 66 cm 68 cm

 

If you are not sure about the measurements of the item, grab a similar item from your closet and compare the measurements. This trick should definitely help you find the right size.
The measurements may vary by 1 to 2 cm.