I'm in the HR department of a casual office/call center. We have a dress code that was developed about 10 years ago and it is still about 95% relevant today...new fashion trends aren't included, so we deal with those on a case-by-case basis. Though we do have a dress code, which employees sign upon receipt, we still have people who push the limits every day and their managers seem oblivious. A policy not enforced is simply a joke. If you are going to take the time to develop a dress code (or any policy) be sure that you are willing to stand behind it and make your managers enforce it. Our policy was developed by upper management, and it seems that they have no desire to ask their managers to enforce it (or several other policies). HR can only go so far, and I'm not willing to spend half my day as the fashion police.