Agreed! Only a few hard-core traditionalists have a problem with the "pan-celtic" concept. Irish usage, as you say, now has a solid century of history behind it, so "Irish kilts" should be an acceptable reality to all. (I only object to folks twisting history and claiming an Irish origin to kilts.)
I think that's a very reasonable statement, to be sure. This "hard-core traditionalist" can agree to everything you said, Brian.

Cheers,

Todd