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 Blue17.527
Adult Medium - Sky Blue1929
Adult Large - Sky Blue21.529
Adult XL - Sky Blue2430.5
Adult 2XL - Sky Blue2531.5
Adult 3XL - Sky Blue2733