We are coming to Ireland in January and I needed to know what
kind of clothing to bring and wear?

The weather is everchanging from cold & raining to warm/cool and comfortable! I would suggest you "Layer" your clothing to allow adjustments during the day. My wife would typiclly wear pants Good Waliking shoes and then a light blouse with a sweater/sweatshirt and carry a light/medium jacket that is rainproof, this way if it was cold she would wear all and when it warmed up she could easily take the jacket and/or sweatshirt for a quick easy adjustment. Hope this helps. BTW Ireland is BEAUTIFUL and the people are WONDERFUL, You will LOVE it there!