Millander heard me gripe in teamspeak about the 63e uniform and how it was the old coat which was supposed to be phased out in 1812 by the "Bardin Uniform." As well as the fact that only the voltigeur companies would have the yellow cuffs and even then it was uncommon. All of that being said though, I actually do like the 63e uniform, it's interesting and not totally historically inaccurate, just inaccurate for the setting of the mod.
About this though, although some of the other skins that may not be considered "accurate" to the setting (Austrian Landwehr, British Guards, 63e, Prussian Grenadiers) they're still based on real, historic uniforms. The point that Millander is trying to make is that all of the other skins are at least real uniforms from a real regiment but the Prussian jager skin has no historical background at all, it's just a made up uniform. I personally like the color combo and I think it looks interesting but I understand Millander's point of view and he is right, it's not accurate to any degree.