I think it is just fine to use the tartan of a group to which you belong in place of a clan tartan for us out here playing Scot, so be proud of your Leather Neck tartan. It may be the only way you can relate to how a Scot feels about the clan tartan. You will understand what I am saying if someone ever starts putting down the Leather Neck tartan; though, I hope that never happens to you.