Just my thoughts but, I feel a person can wear any tartan they like. With that said personaly i like to know a little about the tartan I am wearing. I do this mostly so i can speak about it when i get questions about clans and so on.
I agree. Since, as Thompson has stated, there is no such thing as a "right" to wear a tartan, then as long as the tartan is not "restricted", such as the Balmoral or certain clan/family tartans (the material has to be purchased from the Chief and/or society with appropriate documentation), it is open for wear -- but, as you have stated, if you are going to wear the tartan, you should be prepared to explain why you chose it and know your tartan, as Jimmy has advised on many occasion.

Personally, the least connection, no matter how small it is, is better than none at all.

Cheers,

T.