As I have never been of the "buy it now" school of economics, and even though I have "connections" to all sorts of other Scottish clans, I subscribe to the typically Highland concept of wearing the tartan most closely associated with my surname, in this instance Macmillan.

That said, my advice to you would be: determine to which clan you belong, save up your pennies, and buy a 16oz kilt in that clan's tartan.