There are one or two members, here, that are very keen on a tartan waistcoat(vest) and at least one member who wears a tartan evening jacket. Not to my taste, but either option is very traditional, but not usual these days and no doubt those members will chip in before long.

One thing you must understand, is that mixing tartans of different clans is a definite no no.The mixing of tartans of the same clan is alright, in most circumstances. When it comes to "universal" tartans I am not quite sure what happens, but on the whole it is safer not to mix tartans.