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 Blue1424.5
Junior Medium - Royal Blue1526.5
Junior Large - Royal Blue16.526.5
Junior XL - Royal Blue1827