How common is it for White Americans to wear traditional European clothing (kilts, lederhosen, tracht, vyshyvanka....etc) in ceremonies and in public places?

I am plenty educated, thank you, and the source of that education is not a Google search ending in a website trying to sell me something. But, in rebuttal to this website and the fountain of your knowledge: The kilt is an exclusively Scottish item. The irish "lein-croich" (or léine) was what was traditionally worn and dyed using (probably) saffron. It was not a precursor to the kilt in the same way that, by virtue alone of it being similarly fashioned, it was also not a precursor to the mini skirt. Every county having its own traditional tartan pattern is absolute rubbish. Even so, these patterns were ascribed to Scottish clans, not Irish counties. Irish counties as a concept did not even exist until English colonisation and "shire-ification". This incidentally, is also true for any kind of "Irish clan coat of arms", "family crest" etc. I apologise if you have one hanging in your house, I can assure you it is a pile of rubbish and utterly made-up. Irish people never adopted the walking kilt - or any kind of kilt - to 'show our heritage'. The phrase "Saffron Kilts were first worn by the Irish military in the British Army during the twentieth century" is utterly baffling to me as 1. Ireland gained independence in 1921 and therefore 2. Any Irishmen serving in the British army were by definition not the Irish military (as no such thing existed, or could exist, at the time). I can find no historical sources to back up this statement. Upon further googling, another kilt-shilling website tells me "The saffron kilt is the most common Irish tartan with the tartan being dated back to around 1850 when the Royal Tyrone Fusiliers Militia appointed pipers." Now there are a few hints here to indicate we are being lead astray - first of all, in 1850, the majority of Irish people were quite famously preoccupied with not starving to death en masse and less concerned with the clothing they are doing it in. Secondly, the Royal Tyrone Fusiliers Militia was an Ulster-based force who quite famously put down the Irish rebellion of 1798. It therefore, upon reflection, seems quite unlikely that "The Irish national tartan was introduced as a symbol of Gaelic tradition during the rise of Irish nationalism and as a response to the ongoing anglicisation of Ireland", doesn't it? The only limited use of the kilt on the island of Ireland was/is in pipe bands or marching bands who, despite their geographical location, I assure you do not identify with an Irish identity. It is perhaps worth noting, for the sake of completeness, that these pipe bands also usually feature the bagpipe - a Scottish instrument - and not the traditionally Irish Uillean pipes. Ireland has no 'reknowned makers' of kilts, no more than we have reknowned makers of Italian wine. The Scots have their own culture that they are rightly proud of. Us Irish have our own distinct history that stands among the most ancient and rich in Europe. We have our own traditions and cultures that are older than the pyramids. We don't need something from another culture (bastardised with patronising kitsch by those who oppressed us for centuries) to be retconned into our history just because some people can't or won't tell the difference between the two. If there are regiments of the British army nowadays who call themselves Irish and wear kilts, that is really none of our business, as the British army has nothing to do with Ireland. Despite spending a good portion of the last half an hour googling and a good portion of my life in general studying Irish history, I have been unable to find any source whatsoever on these supposed Irish kilts other than - surprise, surprise - websites that are trying to sell me kilts. Kilts here would only be worn by Scots over for a football match or a wedding involving a Scottish person. I will buy you your very own kilt if you can find one single Irish person (born and raised in Ireland) who disagrees. If you want to wear a kilt, by all means, fire away. Your sartorial choices are your own. But they have nothing to do with Ireland.