What should I wear for an academic job interview?Most computer scientists won't notice and will completely forget what you wore when it comes to decision making time. But the wrong clothes might make a bad impression on some of them and you might meet administrators or faculty from other department with different standards of attire. You never want to give the appearance that you are not taking the interview seriously.
On the other extreme I have seen candidates looking uncomfortable in suits they clearly borrowed or bought off the rack. My suggestion, dress as nicely as you feel comfortable. To be specific, I'd suggest nice pants and a jacket with or without a tie for men. For women the best I can say is dress professionally.
Don't feel afraid to ask the person hosting your visit about these kinds of questions. The host generally wants you to succeed and can tell you about who you will meet and any expectations they may have.