I'm definitely holding out on cordovan leather for my third and final pair of Vibergs for the foreseeable future. Great boots Finn, if I didn't have a pair of black Vibergs winging their way to me I'd snap a pair up.
Take note that I'm wearing a henley tee underneath, not any kind of shirt, so that gives me some extra room in the jacket.
The picture obviously cannot convey the feel of the jacket, but I can tell you if you're a similar frame, that sizing down would be too tight; I would really caution against it. Then again I know the current fashion is to wear everything skin tight, which I'm not really into.
But if you do, good luck to you, and post pics!