Re: Imported Kersey
In addition to the differences in wear and storage over the years, this kind of material varied significantly in color by dint of the manufacturing process. Rather than dyeing the fabric one particular color, it was dyed in the wool, and then certain percentages of black, white, and blue were spun together into the yarn, which was then woven and fulled to produce the cloth. It would have been helpful if they referred to it in the period texts as something like "40% blue-gray cloth" or the like. They did not, however, and there are references to "blue-gray cloth" and "gray-blue cloth", sometimes in the same document. Since Tait was not making the cloth to a British military specification, he was somewhat more free to vary the color. He wasn't the sole source of the cloth, however, so it could be a matter of different mills, different cloth.
From what I've seen, the Tait cloth is a more inky blue, and some of the Richmond Depot jackets are more gray. Could be a trick of the light, though.