Here at _________________, we have a dress code that requires that _________________. It has come to my attention that you have not been following that dress code.
I must ask that you comply with the standards of dress set forth in the Employee Handbook you were issued when you first began working here. Failure to do so will result in disciplinary action.
I certainly understand the desire to _________________; but in the office, we need to maintain the standards set forth by the corporate office. Thank you for your understanding.