Luss-TV visits the Islay Woolen Mill, where the MacKessog tartan is woven. Some beautiful examples of 19th century tartan swatches (as well as some other tartans) are shown.

http://www.youtube.com/watch?v=UIlsF-0swY8

Note: not sure if this thread might be better in the "Heraldry & Tartans" subforum-sorry Mods if so.