No real life experience with Northern Ireland. In fact I try to avoid it, although I have been to Ireland, the independent country. Sorry if that offends anyone, but I am Englishman of Southern Irish descent, and have both Irish Catholics and English (Anglican) Protestants in my family tree, so I figure both sides could potentially think I am one of the other lot! I don't know which area is which, and with my background they could both potentially be the wrong one! Actually, I am an atheist, but that brings to mind Dave Allen's old Northern Ireland joke "But are you a Catholic Jew or a Protestant Jew?". Well, that's just upset a whole load of other people, but my point is just substitute atheist instead of Jew, and it pretty much still works.

As it is, the loyalists (the people who want Northern Ireland to remain in the UK) are predominantly (although not exclusively) of Scottish Presbyterian origin. Some Republicans (that is, nationalists, not the GOP!) may possibly associate kilts with loyalism, due to the Scottish connection. OTOH, I know for sure that some Catholics (who tend to be Republican) have been known to wear kilts, particularly some Catholic Boy Scout bands march in them, or at least have done in the past, but solid colour, not tartan. The 'wrong' kilt in the wrong place might be a problem, but never having been there I'm not sure where the 'wrong' place might be. It may well be much safer than I think, especially as the 'Troubles' are supposed to have ended, but why take a chance?

Anyway, the Black Watch is now (I think) the 42nd Division of the Royal Scottish Regiment, who have their own regimental tartan, and they wear that one. This means that no-one in the British Army now wears the Black Watch tartan, only civilians. I don't even know whether they were even posted there, but it is possible that some people might recognise it as the old "government sett', despite the fact that most people wherever you go can't tell one sett from another. Even if they don't know that much (they probably don't) they can at least identify whether your kilt is tartan or solid, and may form some (almost certainly) erroneous conclusions based on that.

I have taken no political position here. This is all about safety issues. Those who have actually been there say it is safe, except possibly in certain areas. Not knowing where those areas are, I don't think I'd do it.

FWIW, the independent part of Ireland is as safe as houses.