it depends on what you wear on a day to day basis. based on that you can move on from there. like metaldave20 said if you are into wearing skirts, skirt then. I personally like a dress that goes to the knees or a little shorter. Nothing hardcore slutty though. Wear a necklace that matches, and do the hair nice. I like girls that make their hair wavy and wear it long.
i personally like a dress that ends right at the knees or just above or below the knees(not a fan of poofy dresses). some type of necklace that goes wiht the dress. I also like the hair kinda curled, but pulled away from the face.