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Size (cm)	4-6	6-8	8-10	10-12	12-14
Width	35	36.5	39	42.5	46
Height	44	49	54	59	64

Size (inch)	4-6	6-8	8-10	10-12	12-14
Width	13.7	14.3	15.3	16.7	18
Height	17.3	19.2	21.2	23.2	25.1

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.