I love the mature-but-fashionable look. Sometimes, covering up can be more appealing than wearing revealing clothes. A hint of skin here and there is much more attractive than "everything out."
It's best if the clothing complements your body type. For example, a flowing dress might work better on a woman with curves than one who is so thin that it fits her like a drape. On the other hand, tight clothes tend to look better on thinner people.
When in doubt, dress with the same maturity and level of style as the guys you wish to attract.
I love a gal in dresses or long/medium skirts. Some dresses just simply compliment a woman's curves. At the same time, dresses make women look elegant, classy, feminine, and the list goes on. I remember being in a class with this one who who wore a few dresses to class every now and then. She sure left an impression on my mind...