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For tops, Ronhill recommends choosing by chest if measurements fall in different sizes.

Size Chest (IN) Waist (IN)
XS 32-35 26-29
S 35-38 29-32
M 38-41 32-35
L 41-44 35-38
XL 44-47 38-41
XXL 47-49 41-43
Size Chest (CM) Waist (CM)
XS 81-89 66-73
S 89-97 73-81
M 97-104 81-89
L 104-112 89-97
XL 112-119 97-104
XXL 119-125 104-109

Source: www.ronhill.com