This is a great thread.
I think I will nominate the striped blazer with black piping. I don't know how to find a pic, but someone can find it, I am sure.
Astaire, like the DoW, represents a rich vein for this sort of thing. He really knew what he was doing, but he changed his style a bit over time and he also experimented, so you are bound to find some clinkers in the otherwise stellar inventory.