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 Medium - Black Body White Trim2026
Adult Large - Black Body White Trim21.527
Adult XL - Black Body White Trim22.527.5