Getting back to the OP, my understanding is that Scottish Jews had a tendency to wear a regional or generic tartan prior to the development of the Jewish Tartan by a Scottish born, Chabad Lubovich Rabbi. The tartan has proved quite popular and they sell kosher kilts, tartan kippahs, as well as Talits (prayer shawls) with the tartan on the neck band and on the corner tzitzit reenforcements. Most kilts are kosher, but orthodox jews are forbidden to wear linen and wool blends so the lining etc.. is certified linen free.