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Sizing is so difficult (in any jacket manufacturer, IMHO) -- I have an ELC Star steerhide in, an ELC RW 27752 in horse, and a Gibson & Barnes goatskin -- all in 44, all with different fits. FWIW, I like the Star about the best and it fits me just about right.
My best advice would be to use measurements from an A-2 you might already have (or a friends or a similar jacket) that fits well. Take the measurements and ask the sales people what they think would be a best fit. Try-ons are easier, but if you can't go thru the back-and-forth shipping, it becomes a real pain. Makes me wish I was near Duxford or other places where the big manufacturers show their wares.