Ive voted that i'll wear any tartan that I like the look of for daily wear, I have several kilts in various tartans and more in the future im sure.
On the other hand I can only see meself wearing my own tartan for formal occasions, the exeption being a tartan suited to the event for example I want a kilt in the Royal Air Force tartan i would wear that to all formal events which I would be able to (When I dont have to turn in in uniform) in my role as a SNCO(ATC) but the rest of the time when dressing up it would be my tartan that I think of first.