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For bottoms, Ronhill recommends choosing by hips if measurements fall in different sizes. The XXL inside-leg value is 86 cm (34 in); the source page contains a unit typo.

Size Waist (IN) Hips (IN) Inside leg (IN)
XS 26-29 32-35 30
S 29-32 35-38 31
M 32-35 38-41 32
L 35-38 41-44 33
XL 38-41 44-47 34
XXL 41-43 47-49 34
Size Waist (CM) Hips (CM) Inside leg (CM)
XS 66-73 81-89 76
S 73-81 89-97 79
M 81-89 97-104 81
L 89-97 104-112 84
XL 97-104 112-119 86
XXL 104-109 119-125 86

Source: www.ronhill.com