I'll throw in my bit.
The kilt is a Scottish tradition. Not an Irish one.
The kilt has mostly been worn by pipe bands in Ireland for many years.
The saffron kilt is mainly worn today due to the British army wanting to give strong identities to Irish regiments, in particular since the first world war.
Today most Scottish tartans are 'invented'.
Today most Irish people wear a kilt because they think it looks good at a wedding.
I wear Irish national, as an ex Irish Ranger, I should really prefer a saffron kilt, but a kilt looks better in tartan. But I don't.

And by the way, the picture of the Irish guards piper on the previous pages is Denis, my old flat mate and army buddy. Just thought you like to know.

Wear what you like, the way you like, the Scots have been making it up as they go along for the past 200 years, why shouldn't we.