Inspired by Rohag's comment in his Napoleon Campaign review:
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Imperial Guard uniforms
The model for the Imperial Guardsman is entirely impressive, but it resembles an 18th century soldier far more than that of an early 19th century Imperial Guard Grenadier, which is what I would have expected.
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I made a mod that changes the uniform to a more historical one. Install by going to you art directory, select "royal_guard.tga" copy it and paste it in the art file so you have a back up. Then delete the original. Paste this one in there, and whala, you'll see it when you play in Napoleon's campaign.