I think kilts, particularly in North America, are far more common than they were 15-20 years ago. I think there are a lot of factors that contribute to that.

1. Websites like this one!

2. The internet in general. It is far easier to research and purchase kilted attire now than it was then.

3. I also think that Braveheart and Rob Roy, historical inaccuracies aside, have done wonders for bringing the kilt to a broader demographic.