If Rathdowney is the factory outlet you refer to I have been there a couple of times. I bought some Pringle knitwear samples - a twin set for €40 and my husband bought a couple of jumpers in the Pringle shop. He also bought a suit in Joseph which was €70 reduced from €700. It was a very slim fitting trousers and the jacket was almost a perfect fit but the sleeves were a little bit long. Nothing that a good tailor couldn't put right and he did just that. Otherwise, in Joseph, you could forget about getting anything for females that would fit you if you weren't thinner than Twiggy used to be.
In another shop that I think was called Suits You we bought a couple of good shirts.
In Pavers Shoe Shop I bought a pair of ankle boots and a pair of dressy shoes for €90.
My opinion about the centre is general is that I wouldn't be bothered making the 2 hour trip from Dublin - we were passing through and made a point of stopping.
A friend of mine has young children and he said that the Reebok shop is the biz.
There is a factory designer outlet shop in Henry Street beside Arnotts but again only stick insects need go there.