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)
Juvenile 4 - Kelly Green14.517.5
Juvenile 5-6 - Kelly Green15.518.5
Juvenile 7 - Kelly Green16.519.5
Youth Size 4 - Kelly Green1418
Youth Size 5/6 - Kelly Green1519
Youth Size 7/8 - Kelly Green1519