Wolf,

These are all good questions. You'll find a lot of answers in this free publication: Kilts and Tartans Made Easy by Dr. Nick Fiddes. You might also want to visit the articles section of this forum. Last, but by no means least, a wealth of information from kilt and tartan historian Matt Newsome is available here.

Best regards,

Jake

P.S. If those sources don't hold the answer, don't forget about the search feature.