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 - Brown17.527
Adult Medium - Brown19.7528
Adult Large - Brown2129
Adult XL - Brown2331
Adult 2XL - Brown2631