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 - Bright Yellow1524.5
Junior Medium - Bright Yellow1625
Junior Large - Bright Yellow17.526
Junior XL - Bright Yellow18.527