Size (inch) | 0-3 | 3-6 | 6-12 | 12-18 |
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Width | 8,2 | 8,6 | 9,4 | 10 |
Height | 15,3 | 16,7 | 18,1 | 19,6 |
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.