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 - Sky Blue17.526.5
Adult Medium - Sky Blue19.528
Adult Large - Sky Blue2228.5
Adult XL - Sky Blue23.530
Adult 2XL - Sky Blue25.531