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 - Bright Yellow1927
Adult Large - Bright Yellow21.529.5
Adult XL - Bright Yellow2330
Adult 2XL - Bright Yellow2631