When I think of an easy, crowd-pleasing thing to bring back from Ireland, wool scarf is a good pick because it does not need much explanation when you hand it over. I would avoid the obvious tourist print and look for something with a local pattern, fabric or cut that still works with normal clothes back in the UK. I would look for it in a proper local supermarket, covered market, deli, pharmacy, gift shop or small producer rather than leaving it until the departure gate. Back in the UK, it is worth checking specialist shops first because they often stock a better version than a broad marketplace listing. I would rate it higher when it is locally made, clearly labelled and easy to use at home, and lower when it is just tourist packaging.