During my last visit in London I visited the wonderful collection of the National Gallery - and was happy to study the four paintings done by Horace Vernet for the Duke of Orléans between 1822 and 1826.

I made a lot of photos and published them in the uniform section of Napoleon Online. The four paintings depict:

Battle of Valmy 1792 => http://uniformenportal.de/index.php?/category/97
Battle of Jemappes 1792 => http://uniformenportal.de/index.php?/category/96
Battle of Hanau 1813 => http://uniformenportal.de/index.php?/category/98
Battle of Montmirail 1814 => http://uniformenportal.de/index.php?/category/100

Although the text of all images is in German, you may click on the several photos and download them in different size.

I hope, the details shown may be of help in your research about the appearance of the armies.

Greetings from Berlin
Markus Stein