lol @ those people saying a suit shouldn't matter.
its a matter of respect for the company, and whoever is interviewing . Look nice, well groomed and show that you take it seriously. it's also a matter of self respect
My business persona/style and my everyday style are completely different. it's just in the business world, you have to be professional looking and sounding (unless you have such an amazing reputation or that well known/established, than maybe it can be oversighted somewhat).
everyone can afford at least ONE suit. Even the most broke person can go to Men's warehouse and buy something that looks halfway decent.
piss poor excuse, especially for someone who's 40+