Need advice on a Buzz Rickson B-2

Need advice on buying a Buzz Rickson B-2. I've found one in Japan, but they don't allow for returns if it doesn't fit. I have a beautiful Bill Kelso Arco made to custom measurements (~36/38R). From what I can tell, the measurements of a Buzz Rickson 38R look spot-on for what one would expect of a trim/slim-fitting 38R, particularly considering that is wool-lined, and I'll probably want to wear a sweater underneath. Am I on track? Should I take the plunge? Is there anything i'm not considering?

Can't help with the fit, but I have handled a Buzz B2 before now and they are beautiful.