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 - Red Heather13.525.5
Junior Medium - Red Heather14.526.5
Junior Large - Red Heather15.527.5
Junior XL - Red Heather16.7528