Hey Alan-
I think we’ve exhausted the different sources on this that are readily available, but I’ve been checking around to see if I could find anything more than what I originally gave you from Chandler, Bourienne, et al. I checked the St. Helena Medal database on a whim and some genealogical sources for Jean-Noel Foures, but couldn’t find anything. I do not believe military service records that early are on-line (yet!). FYI, the St Helena database is a searchable index that has records of the veterans still alive in 1857 that served with Napoleon with their respective regiments, rank and time of service. It even had 10 Foures from various units, but not Jean-Noel. Oh well….
Sometimes you just have to go with your gut feeling and what will work best. I think going with a cavalry pelisse or dolman is the best choice, considering. I would challenge anyone to come up with the 100% correct answer, but would be pleasantly surprised if someone did.
I know you have references on the Revolutionary period, but for the 22nd Chasseurs and for anyone interested in this period I’d recommend Uniforms of the French Revolutionary Wars (Haythornwaite/Warner), Les Soldats de La Revolucion Francaise (Liliane and Fred Funcken, perhaps their best and most reliable work---see page 93), Napoleon’s Egyptian Campaigns (Osprey-Barthorp see plate B-2), Napoleon's Line Chasseurs (Ospre-Bukhari see page 3 and 4) and there is Rousselot, Elting, and Bucquoy.
Can’t wait to see the finished vignette!