I have a friend that is a WWII buff, and we sat and talked a lot about stuff like the war and the reasons behind it, and you now it's all in the uniform. Once you're in it, it usually does all the work for you.
I like cool jackets - a nice fall or winter coat. You can get a lot of use out of it, and you'll wear it frequently, so it can really set the tone of your uniform for the season.