I pulled this off of THE Clan MacKenzie website...it is about who can wear their tartan-

Is your surname Mackenzie, or a variation of this name? , or
Is your surname among those Septs of the Clan Mackenzie below? , or
Are you related to a Mackenzie or any of the Sept surnames below? , or
Are you sympathetic to the Clan Mackenzie Society's aims and activities and interested in the history of the famous Clan Mackenzie?

http://www.clan-mackenzie.org.uk/clan/mackenzie.html

The last one seems to be a COVERALL