The State Institute of Islamic Studies in Indonesia's second-largest city Surabaya said the dress code banning tight attire was introduced this week after complaints.
"We will have staff watching at our entrances and students who don't wear proper clothes can't enter the campus," deputy rector Hamid Syarif told Reuters on Friday.
The rules did not apply to male students, who were instead discouraged from wearing T-shirts and torn jeans, Syarif said.