The Scrimgeour Tartan
There are actually three tartans, however they are all based on the same design and are really only different "tones". The design is known as "Scrimgeour of Glassary"
The most popular is the "Ancient" Scrimgeour

The others are the "Modern"
(Example to follow)
I have yet to see anyone wear this.
and the "Weathered"
(Example to follow)
A number of members do sport this version, which is a little more muted.
Tartan can be ordered from the mill in Galashiels, Scotland. Kiltmakers in Scotland can order it for you. See the Clan Goods page for more details.
Please do ensure that if you order either some tartan, or a kilt that you specify the version of the tartan quite carefully!