Jeans to an Interview

What to wear to an interview can be extremely confusing sometimes.  I have already mentioned that you shouldn't dress to impress, but should you wear a suit?  Maybe just a pair a slacks with a nice dress shirt? Or something in between?

What if you know that a lot of current employees wear jeans around the office?  Can you do that as well?

The rule of thumb that I have come to understand is that you should always be dressed at least one level more formally than what your potential co-employees are wearing.  This will allow you to communicate that you take the interview seriously, but you are not trying to stand out.

Example: Normal employees wear slacks and polos. I would recommend that you break out the suit with a dress shirt.  You might be able to get away without a tie.