You'll still want to save jeans and T-shirts for the weekend.
Women can increasingly get away with wearing pants.
Just a few years ago, everyone knew the answer to this question. The standard interview uniform was suit and tie for men, and suit with a skirt for women. Anyone arriving at work in a new suit was presumed to be interviewing elsewhere that day. But now that workplace dress codes have relaxed, both men and women have more choices when it comes to interview attire. It's still important to make a good impression.