I have had today's image, a scan from the Sotheby's catalog of the auction of the posessions of the Duke and Duchess of Windsor, for more than a decade and I still learn from it. The photo shows the Duke's odd jackets in his closet at his country home.
First off, all but one jacket, excluding the two tartans and a central European hunting coat, have four buttons on the sleeves, either conventional, leather or, on the tan coat near the back, what appears to be gold (at least I hope those buttons are gold as I used them as justification for my own tan jacket with gold buttons some years ago). That says much about his opinion of one, two or three buttons on an odd jacket sleeve.
Second, again excluding the tartans and the hunting coat, eleven of the twelve are in shades of tan and light to mid brown. The exception is a near-solid light gray. The late Duke was blond, and his coloring appears to have influenced his choices. Blonds look best in low contrast colors just as black haired men look great in high contrast combinations, most brown haired men fall in between and red heads are better off in a palette of fall colors.
The lessons? One legendary dresser preferred jackets that were compatible with his coloring (perhaps that had something to do with his becoming a legend in the first place). And four buttons on the sleeves please.