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 - Sky Blue1524
Junior Medium - Sky Blue15.525.5
Junior Large - Sky Blue17.526
Junior XL - Sky Blue1826.5