Out of curiosity, why *do* the Irish wear green? I don't trust the sources that Google presented to me.
From what I can recall, it goes waaaaaay way back to the Irish Rebellion of 1798, which (if memory serves) was one of many short-lived attempts to overthrow British rule in Ireland. The wearing of green cockades or clothing was one way of showing support for the rebel faction. It didn’t always end well for those wearing it, and the rebellion was put down within six months, but like so many things in Ireland, the events live on in song and sartorial adornment.