Size (inch)	XS	S	M	L	XL	2XL
Width	17	18	19,3	20,5	21,6	22,8
Height	23,6	24,4	25,2	26	26,7	27,5

To get good measurements, lay the shirt (preferably the one you love) on a flat, hard surface, then if there are any creases, smooth them out as much as possible

Width: place the ruler from the bottom of the sleeve and measure the width stopping under the other sleeve.

Height: measure from the highest point of the shoulder (top of the collar) to the bottom of the shirt.