Doesn't seem to have changed, either.
10 years ago when I married the love of my life, we had a Scottish Wedding complete with bagpipes, handfasting ceremony and kilts. Being a Scot by heritage, my family has a gorgeous black, blue, red and green tartan, so I got married in kilts and my bride wore a matching skirt. It's funny, whenever I go out in kilts, it's the ladies who always want to know what I wear under them. I have settled on three answers depending upon who is asking:
1. G-rated..."Shoes"
2. R -rated..."Nothing's worn, everything is in perfect working order."
3. X-rated...Best said with a Sean Connery accent: "Your wife's lipstick".
Fact is, whenever possible, I wear the kilts as traditional. Sometimes I wear nothing but a chastity device. Last year, I was glad I had black briefs underneath when we were in Edinburgh. My wife was walking behind me when a powerful gust blew my kilts way up in back. She said my whole bum was exposed, so it was a good thing we had decided to go out conservatively. Funny side bar: An elderly couple came up to me and said "Sir, we're tourists from America, can we take your picture please?" I was happy to oblige, but I might have had them on a bit if my wife hadn't told them that we also were tourists from America. Edinburgh is not in the Highlands, so the only people we saw along the Royal Mile in kilts were buskers playing bagpipes and yours truly.