I don't think you can change her personality and make her not wear what she wants to wear. You can't really say anything, you haven't even been on a first date with her. I guess this is the key decision on your part to make, date her and tolerate it or find someone else.
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~