Personally I would not wear a suit, or work clothes either. Settle for middle ground, a golf shirt(or casual button up shirt-no T shirt) a pair of Dockers type pants and a pair of leather shoes all in good repair and clean. Make sure you have a shave and look reasonably well turned out. My two cents, I have not hired people before because they looked like they just got out of bed and not even bothered to brush their teeth, pulled on yesterday's dirty jeans and came in for the interview.