Reebok

UK SIZE	Chest (in)	Armpit-to-armpit (in)	Length (in)
XS	31-33	15-16.5	25-26
S	34-37	17-18.5	26-27
M	37-40	19-20	27
L	40-44	20-22	27-28
XL	44-48	22-24	28-29
2XL	48-52	24-2	30-31
3XL	53-58	26-29	31-32