Somebody asked earlier wouldn't it be easier to go to all my classes as a girl? The answer simply is no. There are 3 types of classes at our school. There are large classes that can have up to 400 and occasionally you're not even in the same room as the professor. There are classes that are large with individual TAs assigned to small groups of students. Finally, there are small classes with 40 or less students in the class.
Freshman take their general education requirements in big classes and Seniors are in tiny classes and seminars for the most part. In a large class, you can show up in a prom dress and only the students near you will really notice. In a small one, you'd be busted immediately when your name and gender don't match. The university would certainly allow us to go to class crossgendered, but so much for keeping the secret. So far I haven't had any issues with dressing up for the 2 classes. One has a TA, but he floats around to all the students and doesn't pay attention to names. He does check out the girls quite a bit including, but not limited to me.