A photo would be very helpful. Also, you might want to visit the folks at the Fedora Lounge, they know all things vintage.


http://thefedoralounge.com/index.php

I feel dark forest green wool trousers with cuffs would work nicely.

If feeling colorful, orange corduroy trousers. For very vintage, a white motoring scarf.

Burke,

I don't see the 20's look there.  What do you mean?   I think the coat looks timeless.  I like Incroy's suggestions.  But you can pretty much do anything you want with it as an outercoat, save perhaps more formal (suits and up) ensembles.  That includes anything from chinos and a blazer or tweed jacket, to a grey flannel suit.  At least that's my take.  Putting the coat over the latter just sort of lends a "youthful" appearance.  As far as I know, the idea of the car coat was that it made it easier to get in and out of the car and allowed you to wear it in the car, back in the day when heating and draft was a concern.  There might be other coats that are short too, for other reasons, like military coats (British Warm perhaps)?