Taking this train of thought from another thread just what are the unwritten or written rules of tartan above the waist.
I know the evening wear classic waistcoat cut from the same cloth as the kilt either bias or straight but what other options are there. I know daywear can follow the same but what about two different colourways or setts (large/small, same clan, totally different). What say the rabble?

My reason for asking is that I really like the look of weathered MacLeod of Harris and I think it in a 16oz would make a really nice quilted or fleece lined waistcoat for daywear here in the south. Today's weather only called for minimal layers, a polo and mid weight shirt sufficed. Could a light shirt/shirtjacket/waistcoat of one pattern mix well with kilt of another.