What kilt 'should' I wear?

[bubba]

Black Stewart (Stewart Mourning) is an open tartan as far as I know, as are most of the Stewart tartans. Also, as far as I know, there is no specific British tartan. There is the Govt tartan, which some say is an old Campbell tartan. There are several connected to the Royals as well. What it really comes down to is you're free to wear almost any tartan you want, just learn a bit of the history of it. Offsetting that, many tartans are very recent creations and there really isn't any history to them. The Irish County tartans and corporate tartans are examples of that.