Perhaps you can tell her the contradiction she made, "Another student began stating that I had no right to comment on others clothing. She said I'm too conservative in what I wear," or not.
There is no need to argue over who's right (even if you are). If it gets brought up, ask her why she has that point of view. But if you feel heated, it's best to stay out of it.
And I agree with seaco711.
Proverbs 12:15
The way of a fool is right in his own eyes, but he who heeds counsel is wise.
Proverbs 18:2
A fool has no delight in understanding, but in expressing his own heart.
Proverbs 26:4-5
Do not answer a fool according to his folly, lest you also be like him. Answer a fool according to his folly, lest he be wise in his own eyes.