This is the generally accepted advice. Some interviewers will not care what you wear, but many will, consciously or unconsciously. I would add that this will v

This is the generally accepted advice. Some interviewers will not care what you wear, but many will, consciously or unconsciously. I would add that this will vary by industry and location as well. If you're in the bay area interviewing for a startup, you can get away with a lot more casual dress than if you're trying to get on the IT team for a financial firm in downtown Chicago. One approach you can use is to ask the HR person over the phone what the culture is like, or to look at their "about us" webpage. These will provide other useful signals as well.