Awesome Uniform Resource

Foreign Commissioners in Wellington's Headquarters

An excellent site for 1815 uniforms by Alexis can be found here:  Les Uniformes Pendant les campaign des cent jours

I have spent the last half hour exploring it and have not reached the end.  There are some gaps and Alexis is very open about what is missing.

While you may need to brush up on your French, as the site is written only in French, the source is very well done!