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 - Light Blue Heather16.526
Adult Medium - Light Blue Heather1927
Adult Large - Light Blue Heather2129
Adult XL - Light Blue Heather23.530.5
Adult 2XL - Light Blue Heather25.532