oh bhai iss kisam taleemi idaron k hostels main jo kuch hota ha uss ka bhee kuch pata ha k nahi??
Anyway 1. Security cameras ok not an issue.
2. Dress code If already had been mentioned in the forms then students had to follow.
3. in Many institution specially those living in hostels, girls do go on dates and their parents don't know (though its NOT something to be banned or ashamed of), however, this also put security of the girls and reputation of the institution. If any unpleasant thing happened to the girl, then the institution is dragged.
Lastly you must dig why they had been forced to impose some rules now. There must be some unpleasant incident or Parents complaints.