Not always. Kilts are worn by men at special events, such as Weddings, Burns night...etc. We don't go around wearing them all the time, that would be stupid.
Since the middle-ages. Also, it's 'Scots' not Scotts.'
I did not see anyone in Ireland wearing long S-O-C-K-S when I was there. If they did, it was under their pants, and likely because they were cold. You may be thinking of men wearing tall socks with their kilts. Both the Irish and Scots wear tall socks with traditional dress kilts.
Yes, Celts do wear kilts. However, Celts typically originate from Ireland. Kilts actually originated from Scotland and the Celts just took over the fashion trend.
kilts
they don't - Scottish men wear kilts on special occasions. Irish pipe bandsmen wear kilts only when playing music
Kilts
Kilts.
cloths or kilts
Scottish
Very few Irish People wear kilts, it is really a modern Scottish phenomena. The only people to wear kilts are pipe bands etc.
Kilts are the traditional dress of the Scotland. They wear kilt to show their culture and history, but it is not restricted to wear a kilt only in Scotland. So anyone can wear it, thats why people from many other countries wear a kilt and shows their interest in wearing a kilt.
Antrim's Ulster Scot settlers mostly came from the lowlands of the SouthWest of Scotalnd and typically wore the same dress as the Irish. The gentry tended to wear English clothing. There were also many Scots warriors (Galloglass) from the highlands wore a 'rough dress' not unlike the native Irish. There were probably no kilts as we know them today.