Once which come in category of sexy and she likes and is comfortable with... + it's less about the dress, it's about the body, if she is sexy and waxed, she does not even need clothes to look good. If you know what I mean. Still if she wants to pick a dress I like skirts when we are alone, and if people around but in home shorts are okay and if we are going out definitely jeans, I love sexy legs and want her legs to be safe, not a scratch.
I like it when women are modestly dressed and have matching colors, preferably dark colors. There was an entire, huge lineup of modest fashion for women when I was kid, now it seems like they dress more and more revealing as time goes on.