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 Blue1827.5
Adult Medium - Sky Blue2028.5
Adult Large - Sky Blue21.527
Adult XL - Sky Blue23.530
Adult 2XL - Sky Blue25.530.5
Adult 3XL - Sky Blue2732