I just went over to the MacKenzie Clan website

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

Here is what they say on the front page about wearing the tartan:

-----------------------------------------

Septs of the Clan Mackenzie

Charles
Charleson
Clunes
Clunies
Cross
Iverach
Iverson
Ivory
Kenneth
Kennethson
Kinnach
Kynoch
Macaweeney
MacBeolain
MacBeath
MacBeth
MacConnach
MacCure
Maceur
MacIver
MacIvor
MacKenna
MacKenney
MacKerlich
MacKinna
MacKinney
MacKinnie
MacLeay
MacMurchie
MacMurchy
MacQueenie
MacThearliach
MacVanish
MacVennie
MacVinish
MacVinnie
MacWeeny
MacWhinnie
Makiver
Murchie
Murchison
Smart
Tuach
NB There are several variations in the spelling of the name Mackenzie, i.e. MacKenzie, McKenzie, Macenzie, McEnzie, Makenzie, MaKenzie, M'Kenzie, Kenny, Kenney, MacKenny, MacKenney, McKenny, McKenney, Mackinzie, McKinzie, MacKinney, McKinney &c, they are accepted as Septs or variations of the Mackenzie Clan name. Often in centuries past it was the local Monk or Minister who could read and write and who also decided on the spelling of people's names when entering Baptism, Marriage or Burial records. So when writing an unfamiliar name it had to be written as it sounded and misspellings would often occur especially when the informant had a strong accent. If you are not sure that your name was derived from "Mackenzie" or a Sept name then please do ask us.

If your name is Mackenzie, one of the above Sept names or a variation then you are entitled to wear the Clan Mackenzie Tartan.

-----------------------------------------


Now given that I would say that it is not a Universal tartan, however you could write them for permission, or go out and get it for yourself, if you feel comfortable doing that.