A French uniform (as much as I hate to say, being British) makes the most sense to have, considering they were the strongest (still got served by Brits at Waterloo though
) military power of the Napoleonic Era, and it was Napoleon the French Emperor who personified the Era and led the French to many great victories.
But I agree, if it's not a time consuming change to make then it'd be nice to make it customisable.
An alternative would in fact be to make a faction-neutral model for that. Perhaps a unisex civilian dress or something...
Evan