I agree with David in part...a suit looks the part and more serious, though a smart pair of jeans, shoes and decent shirt will do the trick. Though I have been told by some (myself included in employer ranks) that these days a lot of people frown on a suit...depends on the persons doing the interview. You will be fine tweety, the clothes will help but at the end of the day...they will be looking at you mate..relax and be you.

cheers bullet