As we all know, uniforms changed a lot during the Napoleonic wars, and I've always found 1790's uniforms much fancier and good looking than 1810's. Therefore, my idea is the following:
A full skin pack, covering all nations, in which we go back to 1795's uniforms. Ergo bicornes all over the place, British using their fancy lapel'd uniforms, French royalist regiments marching around and Austrians getting their arses kicked.
Ain't this fancy?