A police officer in muslim clothes may be a symbol for self-discipline that is too positive. Going to far with good habits.

To dream of Muslim people represents aspects of your personality that have sacrificed too much to positivity, or are too preoccupied with morality or good behaviour. A muslim in a dream reflects excessive sacrifice or cheating yourself out of happiness due to moral dogma or rigid discipline.

To dream of police officers represents discipline, intervention, and enforcement of behavior. In your waking life you may feel trying to make changes, resisting bad habits, feel like you are being forced into certain conditions, or even feel like you are facing karma. A police officer usually means you either want to change, or feel you have no choice. Police may also represent your fear of change.

Source: DreamBible.com