Someone please correct me if I'm wrong, but from what reference materials and highland dress I've seen, a kilt has two buckles on the right and one on the left, but a tartan skirt had two on the left and one one the right, similar to how men's shirts and pants are buttoned opposite women's blouses and pants.

Now, it shouldn't be that difficult to switch the second strap right to left, should it? A very simple alteration (I'm leaving out the direction of the pleats, because I can't recall of the top of my head). Men's kilt one way, tartan skirt the other. Just a thought.