Writing to the Chief of a Clan does not guarantee a reply one way or the other.

A Chief has the power to recognise a tartan but after that they do not appear to have any control over the production and distribution of that tartan. Very few tartans are actually restricted and I am not aware of any Clan tartans that have a restriction.

You will get those who argue that silence equals consent and those who argue that it means the opposite. You pays yer money and you takes yer choice.

I for one do not feel guilty about having and wearing my MacPherson Red nor other Clan tartans of which I am not Clan member. I wear them with respect and honour and I am sure that it is also good advertising for that Clan as many people would otherwise not have the chance of seeing it worn.