Quote Originally Posted by gilmore View Post
As I recall, one of the oldest tartans is one of the MacGregor's, the simple red and black Rob Roy tartan.
The tartan you are referring to is the MacGregor red and black (aka Rob Roy) tartan. Here's a bit of history about this tartan from Sir Malcolm MacGregor, Chief of Clan Gregor:

The Red and Black MacGregor Tartan

This tartan existed long before individual tartans became associated to particular clans Perhaps because it is one of the easiest setts to weave. There are those who question MacGregors' claim to this tartan as there are portraits of monarchs and other Highlanders wearing this sett. It is also claimed that it is not known what MacGregors would have worn during proscriptions and that they would not have worn their clan tartan so proudly. Two points here. First, I would argue strongly that due to proscription, the clan adopted it in 1603 because at that time it was not regarded as a MacGregor Tartan. It is my belief that by the end of the 18th century, nearly 200 years later, it came to be regarded as such. It is a fact that my family have worn this particular tartan since the late 18th century and regarded it as MacGregor tartan. My great. great. great, great grandfather would have worn it for good traditional reasons (see below), not on a whim. The tartan is included in the Highland Society of London's collection of 1816, which lends credence to this belief.

Secondly, if the MacGregors themselves survived the proscriptions - is it so surprising that the tartan survived? Laws passed in Edinburgh and London were difficult to enforce in the Highlands and it is quite possible that in the Highlands people would have worn the tartan of their choice. The wearing of a particular tartan demonstrates a blood connection with a particular clan. Even my kinswoman, Miss Jean Rollo, who lived in Edinburgh in 1746, made it a point to wear a tartan gown in the Canongate in defiance of the law!