I'm so please to have found this thread! I'm new to the whole 3D Animation thing, and I've been looking for War of 1812 Red Coats!
I've been working 10 years on a video history of the small community in which I was raised (http://beachvideo.info) and much of it is in the can. There were 2 incidents there in 1813. First was the American raid on a British Government installation, the King's Head Inn, and the burning of the Inn and the outbuildings. I have shot almost everything I need for that at re-enactments, and with the help of some US period army, navy, and marines. Burning the inn is gong to be a challenge, but I plan to do it with particleillusion.
A bigger challenge will be "The Burlington Races", a Lake Ontario battle between 2 squadrons, each of about 8 vessels, one squadron British and one American .  I'll be needing Red Coats of several regiments (historically selected!) American Army in the Blue and the Grey uniforms (they ran out of blue cloth), Officers on both sides, including Ship's Captains, and a Commodore on each side, but the regular seamen on both sides wore almost the same uniforms, or maybe, more accurately, non-uniforms!
I'm certainly not an expert on British period uniforms, but from my observations, some easy colour changes for the fabrics, some alternative badges for the Shakos, and an assortment of various fancy epaulettes and stripes across the chest, plus a number of different brass buttons, would make it easier to dress many British regiments, and a few extras, like kilts, different head gear, etc., would make it possible to match most regiments involved in the War of 1812 in North America.
I understand that the problem gets much bigger for the Napoleonic War with more British Regiments, and more countries involved, and I assume there are people around the world with an interest in the war in Europe, but since North America wasn't involved in that one, the preference in Canada and the USA would most likely be the War of 1812, especially in Upper Canada (Ontario), Lower Canada (Quebec), and the U.S. States involved first hand in the war here.
A couple of other things: from what I've seen in re-enactments in Ontario and New York, with many of the re-enactors coming from many eastern states, pants were baggy! I don't understand this tendency for most of the male figures I see for sale to wear very tight pants! Is it the Blue Jeans culture in which the younger people have grown up? Also, there were only 4 fabrics in those days: wool, cotton, linen, and silk, and soldier's uniforms weren't made of silk (maybe those of a few officers!). Lets lose the shine!
I regret that as a brand new practitioner in this hobby, I wouldn't make a good tester. But as a customer, I'd be among your very first buyers.
Please keep me informed regarding progress. And if you need any help finding photos of 1812 uniforms, I could help you find pictures of the different regimental uniforms on the internet.

Good Luck, and I'm pulling for you. Let me pull harder!