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 - Red17.527
Adult Small - All Over Print17.528
Adult Medium - Red19.528
Adult Medium - All Over Print19.528
Adult Large - Red21.530
Adult Large - All Over Print2128
Adult XL - All Over Print23.531
Adult 2XL - All Over Print2432