When I was growing up and visiting Irish relations the only kilts you saw were in pipe bands during the marching season there. They were usually either tartan or plain saffron or green but the locals never wore any tartan despite having Scottish names. Last year I passed a wedding there and all the men were in kilts and I believe that the biggest numbers hiring kilt outfits are from England nowadays, not Scotland. There are even Welsh tartans nowadays and I well remember my tailor a few years ago now joking about how there would soon be a tartan for every name in creation. I think it is great that we have something in our tradition so much sought after.