What is th traditional Irish man costume?

I don't think there is one. Perhaps because of continued occupation for may centuries, people were more or less forced to follow the dictates of the coloniser. Perhaps the same thing applies when one asks about a "Typical" Irish House. It is only fairly recently that the Irish were in a position to have houses built to their requirements, and then, probably because they had no real tradition to call upon, we now have so many "Hacienda" type houses, that look so out of place in the Irish countryside. Kevin McCauley.