"I'm With Melbourne" Men's Tank Top - Workout Gym SingletThe perfect muscle tee look for summer and the gym. Now, do 10 push ups. Size Body Width (cm) Body Length (cm) XS 45 69 S 48 72 M 51 75 L 54 78 XL 57 81 2XL 60 84 How to Measure: Lay an existing t shirt flat. Body Width: Measure 3cm below armpit, from one side to the other. Body Length: Measure from the top of the shoulder to the bottom of the t shirt.