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 17.5025.50
Adult Medium 1926.50
Adult Large 22.5027
Adult XL 2328.50
Adult 2XL - Charcoal2428
Adult 3XL 2531.50