Campbell Tartans
There are just four authentic Campbell tartans recognised by MacCailein Mor: Ancient or "plain" Campbell, Campbell of Breadalbane, Campbell of Cawdor, and Campbell of Loudoun.
To be faithful to Scottish tradition, only those descended from the Houses of Breadalbane, Cawdor and Loudoun should wear the tartans belonging to those houses; all other Campbells and members of other Campbell septs should wear Ancient or "plain" Campbell tartanwhich is composed of threads of only three colors:
blue, green and black--with no overstripes of any other color.
The 42nd, Government or Black Watch tartan is Campbell tartan in darker shades and is perfectly acceptable.