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 - Navy Blue17.527
Adult Medium - Navy Blue1928.5
Adult Large - Navy Blue2128.5
Adult XL - Navy Blue23.531
Adult 2XL - Navy Blue24.531