Belive

Size (inch)	XS	S	M	L	XL	2XL
Width	18,5	19,5	20,8	22	23,2	24,4
Height	33,8	34,6	35,4	36	37	37,5

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.