Answer: This is a very timely question - and one that I think many people are asking these days.
So many of the firms - if not just about all of them - have gone casual dress year round. Even the bastions of conservative business dressing - the investment banks - have dropped their strict dress codes and now allow a casual dress code.
So what does one wear to an interview at a firm that has a casual dress code? Believe it or not, and I expect to hear some criticism about my answer, you still need to dress in business clothes for an interview, no matter what the dress code may be at the firm where you will be interviewing.
Before we get into the specifics, let's talk about the bigger problem. If your firm is casual, and more than likely it is, how do you show up at work in full business attire without drawing a lot of attention to yourself?
If you are working with a recruiter, the solution is easy. Simply drop your interviewing outfit off at the headhunter's office and, prior to the interview, go back to this office to change into your business clothes. If your house or apartment is nearby, you might want to leave your office 30 minutes earlier than you normally would and go home to quickly change.