The second one. Too many times girls go for the third look and it rarely impresses me. It's the first date, you should be trying to look a bit better than usual and maybe around the time you want to get sexual with him or something then you pop something more daring out but you appear so much more like a sensible person when you stick with something simple, yet sophisticated
i think your outfit's are real pretty but the most important thing is that you have to be comfortible in it. If your not confident and comfortible you won't come across right and other people will notice it.