Ok, with your very bold question here. (I would advise not to use caps lock, as it tends to turn people away) My question to you is, do you mean how it moves, or how it looks. This seems like a silly question to me, unless you have a scene where the cloth actually becomes water soaked, and changes properties because of it. If so, I don't know. But if you just have wet cloth to begin with, all you have to do is edit the properties to give it some weight, no?