There should be no restriction here. It is the girl's choice what she wears but we can consider this fact that girls should wear clothes that suits their body - type and same goes with women. If someone's is confident about wearing a dress and carrying it, then there should be no restrictions. And one thing Sometimes Girls even have 2 compromise and they shoud avoid to showy dresses. The most inportant thing is for a girl to know is she has 2 wear clothes according to the atmostphere present and there should be no compromises for it.
Hope it helps!