1. You can't go out like that. Since there is no physical limit on it, this is not true. Unless we were trying to go out in an elaborate costume that was too big to fit through the door but how often is that the case?
2. You may not go out like that. That's more accurate, but what is permission? Anybody in that situation would probably realise that there were now two people in the equation: the person wishing to go out dressed in a certain way and the person who considers it their right to monitor your attire. It is an arrogant assumption, though, because what they mean is option number 3 and they phrase it this way out of an assumption of authority.
3. I do not want you to go out like that. That's the most accurate, and in that position most people would say that they do not care what somebody wants. It states the person's position without implying that there is anything objective about their opinion. They state their dislike openly and without any arrogant assumption that their desire is universal (though the assumption that what they want is automatically important is still on the arrogant side).
4. Are you sure it's a good idea to dress like that? In response to your query, I make you aware of a reason why you maybe wouldn't wear that that you might not have considered before. This option respects the autonomy of the individual and demonstrates the principle that a good, reasonable idea is not afraid to explain itself. If there is a good reason for not dressing a certain way (dressing lightly in the middle of winter, for example) that is one thing and worth listening to. If there is no good reason, the idea, the request or imposition has no reason at all to be respected in the slightest, regardless of who expresses it.