What happens with a new chief?

[ThistleDown]

The only authority on recognised tartans of a clan is the chief of that clan. To quote the late Duke of Argyll on this matter:

"...the only tartans which I recognize are, firstly, the one you see me and my wife wearing, which goes under various names, such as ordinary Campbell, Ancient Campbell, etc., and all members of our clan who are not specifically identified with [the Houses of Breadalbane, Cawdor [or] Loudoun are entitled to wear it.
Let me get rid, once and for all, of the thought that there is a 'Campbell of Argyll' [tartan]. While it is true that the Sixth Duke [of Argyll - b.1768 - s.1806 - d.1839] introduced a white line to his plain Campbell tartan to differentiate himself from the rest of the Campbells, (he being the chief and entitled to do so), he was the only member of the family so to do and the rest of the family thought he was rather pompous to do it.
Campbell of Breadalbane--fine [to wear].
Campbell of Cawdor--fine.
Campbell of Loudoun--fine.
Campbell of Glenlyon--I have never heard of it.
Campbell of Loch Awe-this is plain ridiculous, as we are all Campbells of Loch Awe originally. - Apart from anything else, I have never heard of a Campbell of Loch Awe tartan, nor do I wish to do so.
THERE IS NO DRESS CAMPBELL [TARTAN]--repeat! repeat! repeat!
There is NO HUNTING CAMPBELL.
There is NO CAMPBELL RED.
There is NO CAMPBELL - SIMPSON.
There are no Campbell cheques, other than commercial ones...
If I feel strongly about anything and would like it inscribed on my tombstone, there might be a few lines such as 'All Campbells with the exception of the three principal septs [the Houses of Breadalbane, Cawdor and Loudoun] should wear plain undifferentiated Campbell for evermore and not get confused by peddlers of this [other] material that comes under all sorts of guises."