I don't think the open world is such a good idea because if I imagine that you could walk around naked in GTA, for example, everyone would look at you stupidly and you'd probably get arrested by the police.
Ok, this isn't about GTA, it's about the possible development of a new game, but if nobody would mind someone walking around naked in the open world, the player would say: "It's just a game. You can't do that in reality anyway!"
To promote naturism, it should definitely be realistic...