First
I had not noticed that these are your posts 1, 2, and 3!

Actually, several of our members are Welsh! They call it a Cilt and a common poster (with pics) is Derek, our cardboard cutout (note how the pose is IDENTICAL in so many posts), and there are Welsh tartans too.
Matt Newsome (owner of the site mentioned by CajunScot and referenced by me above) is the curator of the Tartan Museum. He is free to many, many questions. I have pestered him quite a bit, as have many fellow X Markers. Feel free to call him.