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)
Adult Small - Hunter Green19.525.5
Adult Medium - Hunter Green20.526.5
Adult Large - Hunter Green2228
Adult XL - Hunter Green2228