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 - Banana Yellow17.527.5
Adult Medium - Banana Yellow2028.5
Adult Large - Banana Yellow21.530
Adult XL - Banana Yellow2430.5
Adult 2XL - Banana Yellow2631