Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Junior Small - Royal Blue1523.5
Junior Medium - Royal Blue1625.5
Junior Large - Royal Blue16.525
Junior XL - Royal Blue1727