"I don't know the actual uniform regulations for the National Guard but I think at this period they would have had a fairly motley appearance with very few being in the prescribed uniform. Elting in 'Swords Around a Throne' mentions a unit of Breton national guardsmen going into battle wearing round hats and wooden shoes. "
I cannot agree on this – the cohorts from which new line regiments were formed in 1813 were fairly well equipped and uniformed, the tunics, a good question, my guess would be initially the old style coat.
Later on – in 1814 the story may be very different.
Steve Smith my hero – put up a usefull link on that topic on napoleon-series.org
"y:Steven H. Smith <Send E-Mail>
Date: 3/2/2015, 10:08 am
I had not seen this series of documents: Archives parlementaires, recueil complet des débats législatifs et politiques des Chambres françaises de 1800 à 1860, faisant suite à la réimpression de l'ancien "Moniteur" et comprenant un grand nombre de documents inédits. 2e série, 1800-1860. 1867 SER2, T11 (10 Août 1810 Au 30 Septembre 1813)
Of possible interest those relating to the garde national formation in 1812 – the whole set of regulations are at link
Lotsa other stuff to look at therein. There are name and subject indices at the back. "