Nope. I think there are only a few other people in the country who wear this tartan; it's not one of the popular ones. I know of someone online who wears it, and actually did see another dancer wearing it at a competition not long ago, but, um, you'll know the difference even if she's there, as she looked to be about ten or twelve. I look young, but not THAT young.

Each dancer chooses her/his own tartan. I'm sure there are professional dance groups who all match, but... they can afford to buy a second kilt, no doubt. Such groups are not that widespread, though-- Highland dance hasn't taken off like Irish did with Riverdance and all. Some dancers wear their family tartan... most, I think, just pick what they like; I know of some with Scottish last names who are wearing different tartans (though they may come by it honestly another way). I think dancing is another of those things where you get a bit of a pass for wearing a tartan that isn't "yours," especially since it's popular to buy outfits secondhand, which means a beggar can't always be a chooser (esp. when an adult, and secondhand outfits are few and far between).