Diane's been dancing for quite a few years now, and she's always worn the sash on the right but I see a fair amount of ladies wearing it on the left sometimes, too.

I'm mostly just interested in where these rules and conventions came from.
I hear so many rules bandied about for kilts which have no real basis in fact or custom and I wondered if this were something similar.

Matt's article helped. (I should have checked his articles first, huh?) And it made it pretty clear that this, with many other kilt and tartan things, just seems to have been rules that someone says they got from somewhere else and it's turned into 'the done thing.'
That's just find with me, custom forms from usage, after all.