I’m in the process of laying out some aspects of this in a set of pages here, beginning with some thoughts on sources, then moving on to look at elements of the dress of the Legion in the light of those.
It seems to me that it’s a matter of unravelling some of the received wisdom, revisiting some primary sources and trying to take a fresh look. If and when new information comes along, the pages will be amended. And I’m always happy to be proved wrong!
So far, five pages: on sources, the Line Battalions, the 1st and 2nd Light Battalions, the early Light Dragoons and the 1st Hussars. Other elements of the Legion to come in due course.
Links are just to your right, at the top of the side bar, under “Pages”.