Okay I don't know how your sewing/light pattern drafting skills are but I can tell you how I would go about reproducing this coat.
Basically you look at the overall shape and style lines, you then decide what makes this coat this coat. You find a couple of patterns that each have one or more element that is important to the overall look of the coat. You then make many muslins working to tweak things like the collar, the fit, the way the pieces fit together.
Ok if you are feeling overwhelmed I did find a couple of patterns that I think would start you in the right direction
I would use #7979 for the majority of the coat and try to work in the asymetry of the opening from #7772 you will have to redraft the collar, just go buy a ton of muslin make yourself a tape dress form and buy those two patterns and lock yourseld in a room for a week.. and be sure to post your fabulous new coat of course!