It's the age-old question. What is appropriate to wear to a work interview?
According to this New York Times' article, when thinking about your interview wardrobe you should "err on the side of conservatism". And I definitely concur. If you do not know much about the company you are interviewing at (aka if it's conservative or if it's casual), then you should always wear the most formal outfit in your closet.
Formal for us Working Girls means a suit - this can be a pants suit or a skirt suit. I personally favor the skirt suit - there's something about a pants suit that makes me feel like a linebacker. The pros suggest wearing low heels and hosiery.
There is always an exception to the rule however. The creative world is always a little less dressy. I have a friend who works at an ad agency and she could wear sweats to work if she really wanted to. At a company like this, it's definitely acceptable to show up in a more relaxed version of a suit. For example, when I interviewed at a luxury magazine when I wanted to be an intern in NYC, I wore bermuda shorts, a nice sweater, and low heels. And I scored the job. Later I found out that it was down to me and another girl who showed up in a full on pants suit and she seemed just too conservative for the job. They wanted someone more fun who liked clothes (and could therefore write about them).
It's important to know who is going to be judging you. But if you're unsure, always stick with the suit. Looking more professional is never a bad thing!
I also think a nice (and conservative) dress is appropriate for us Working Girls to wear to an interview. Keep in mind though that you should not be showing off too much boobage or too much leg. We don't want the boss to get the wrong idea and therefore slash you from the competition completely.
And don't forget to wear panty hose!