Kilts???

[Galician]

Yes and no. A solid green kilt often (but not necessarily) connotes an Irishman; a saffron one always does. A red, black, or blue one doesn't mean anything to my knowledge. Someone wearing a Maple Leaf tartan is quite possibly Canadian; a "Leatherneck" tartan a US Marine, a person wearing the Ramsay tartan might belong to the Ramsay clan, or simply like blue.

I would dispute that. While widely accepted by Irish groups, there's historical evidence that it was used widely by Celts on the continent, before migration to the British Isles.

[Monkey@Arms]

Welcome to X-marks, Sam.

You'll find a lot of answers in this free publication: Kilts and Tartans Made Easy by Dr. Nick Fiddes. There is also a wealth of information from kilt and tartan historian Matt Newsome available here.

Best regards,

Jake

P.S. If those sources don't hold the answer, don't forget that the search feature is your friend.
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[Woodsheal]

I would dispute that. While widely accepted by Irish groups, there's historical evidence that it was used widely by Celts on the continent, before migration to the British Isles.

Sorry, but this is simply incorrect. Bare-legged kilt wearing developed uniquely in the highlands of Scotland due to geographic and terrain considerations. All other northern-Europeans (including the large and diverse mass of Celts) were trouser wearers...!