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 - Bright Yellow1826.5
Adult Medium - Bright Yellow2029
Adult Large - Bright Yellow21.530.5
Adult XL - Bright Yellow2429.5
Adult 2XL - Bright Yellow2630.5
Adult 3XL - Bright Yellow2833.5