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 - Silver 16.5
Adult Medium - Silver 19.527.5
Adult Large - Silver 21.529
Adult XL - Silver 2430
Adult 2XL - Silver 2531