When is a dirk appropriate?

[Piper]

Thanks again for the insight. While I am actually aware of why the dirk and sgian dubh were originally worn on the right side, I was just wondering if some rule of etiquette required it.
As it seems it's just convention (and the assumption that the wearer is right-handed), I'll continue to wear the sgian in my left sock. Should I ever get a dirk, well, I'll make up my mind about that then. As long as I know that I'm not inadvertently being rude, whether anyone else understands why I would wear it on the left means little to me.

Another southpaw here. As a Jacobite reenactor, when I wear my great kilt, I draw the plaid over my right shoulder, so as not to encumber my "sword arm". However, as a piper, the sword rarely leaves the scabbard. I usually wear my dirk just to the left of the sporran, as seen in some old illustrations (also the only time the dirk leaves the wall). I can draw it with either hand, as needed. One never knows when you'll have to dispatch a surly roast, or rampaging watermelon.
The only person at an event to comment on the "left handedness" of my belted plaid was another reenactor, who thought it was because I was a piper (to keep the plaid clear of the drones).
In modern dress, when carrying a sgian dubh, I carry it on my left leg, I'm not aware that anyone has ever noticed the difference.