Since you mentioned your Civil War ancestors, I might mention there is a Federal Memorial tartan that is specifically designed to commemorate the service of those Boys in Blue who fought to preserve the Union. Matt Newsome made up a kilt for me from custom woven material sewn to the original design of the kilt of the 79th NY Cameron Highlanders, another celebrated Civil War regiment. It's not common, so when people ask what it is it gives you the opening to tell them about your ancestors and what they mean to you.