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 Blue1825.5
Adult Medium - Sky Blue1928
Adult Large - Sky Blue20.528
Adult XL - Sky Blue22.529.5
Adult 2XL - Sky Blue24.530.5