That was made in Poser and just like Daz Studio all of that was done by animating the figure. The clothing was Dynamic so it can be done because DS has dynamic clothing also. But neither program has gravity in it. That was all pure skill of the person who made the video.
Thank you guys, the optitex hair and morphs you suggested will do what I have in mind. Would you have suggestions on which hair is the most realistic so far for V4 or V5? I would prefer V4, because a lot of nice morphs and stuff are already available for it.