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 - Charcoal1523
Junior Medium - Charcoal1524
Junior Large - Charcoal1724.5
Junior XL - Charcoal1726.5