Canopy Books, 1993. This contains some of the best color plates I've seen so far. I disagree with Hildegarde as to why we have no examples of secular work. I do not for a moment think that they did not exist. The church pieces were more carefully kept and less often used, so they survived longer.
Churches tend to be very careful of such pieces.
A friend in the clergy related a story to me of how he saw a several hundred year old piece of embroidered vestment used for Easter services, I think in England. The wearer was outfitted with a structure of wire and netting about his ankles to catch stray threads or bits of gold that might fall off, so that repairs could be made later. True, this is a modern example, but such care is why these vestments have lasted through the centuries. Conversely, secular pieces were worn, and therefore, wore out. Not only that, but at least in later period, we know it was customary to remove embroidered decoration from one piece of clothing to move it to another.