Found at this site:
http://forums.bobdunsire.com/forums/arc ... 81706.htmlI quote
"I think that Irish kilts are a modern innovation, likely first used
by Irish pipers 90-100 years ago, but later also worn by Irish
dancers. They are often saffron colored but may also be other colors, such as
green or red. The pipers of the Irish army and of British
regiments with Irish honors (eg. the Irish Guards, the London
Irish Rifles) wear saffron kilts. I think the pleats are somewhat
different and a sporran is not always worn (in the Royal Irish
regiment they are, I think, but in the Irish Guards, they are
not.)"