From Library Journal:
"This unique work illustrates French military costumes from the 1780s to 1830: infantry, cavalry, engineers, musicians, cadets, aviators (in a balloon corps!), fencing masters, Swiss Guards (and other foreign units under French command), and many other categories. All ranks are shown, as are the distinctive uniforms of many different regiments. Elting, a military historian, supplies informative comments on each plate. The nearly 2000 watercolors were painted for him by Knotel (d. 1963), a German authority on military costume whose father Richard (d. 1914) was in his time the world's leading expert in the field. The younger Knotel's Handbuch der Uniformkunde (Hamburg: Schulz, 1937; 7th ed.) is a classic but does not compare in beauty with the present work. Though Napoleonic Uniforms has an inadequate glossary and lacks page numbers, index, and an over-all table of contents, it is indispensable to anyone seriously interested in the subject."
to be definitive as to uniform cut, color, and appearance.No, there are numerous other museums, even in France (the Brunon collection, Musée de l'Émperi for example) - and then the private collection and then a lot of other primary sources, like the Elberfelder, Meissner, Dönitzer, Lüneburger, and a myriad of others - but definitive - not at all.