On the way back from Belfast there's a place called the outlet. It's on the left hand side, you can't miss it. The female half of the couple will like it, from my experience.
Last time I was there was about a month ago and they were offering euro for pound exchange rates. Mens suits were 100 euro for good brands with free shirt and tie, and 120 euro for two (suits) for unkonwn brands that looked ok. Cheap place