Sizing Information Size Measurement A Measurement B Small 24.5 inches (62.5 cms) 16.5 inches (41.5 cms) Medium 26.5 inches (67.5 cms) 17 inches (43 cms) Large 27 inches (69 cms) 18.5 inches (47 cms) X Large 28.5 inches (72.5 cms) 19.75 inches (50 cms)

As sizes can vary between manufacturers, I would recommend the following: Find a T-shirt that you are happy with in terms of fit, take the same measurements illustrated above, and then select the nearest match from the table.