Been looking around the web at the various War of 1812 sites and seeing what looks good - this group took my eye - it has a great look to its webpage and the overall impression is excellent. This is possibly what is needed in the UK - which isn't so far-fetched if you take on board the number of American civil war enthusiasts coupled with the number of Napoleonic enthusiasts in this country.
Have a browse of the First Regiment Volunteers website - this pic is from their section on the hunting shirt or rifle frock. A scetion on primary source documents for the militia of the period gives a useful insight into the colourful attire of the new Republic's citizen soldiers.