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 - Light Blue Heather1425
Junior Medium - Light Blue Heather1525.5
Junior Large - Light Blue Heather15.526.5
Junior XL - Light Blue Heather1727