What Robert said
Also, Single Sex schools tend to be very conservative (I went to one). You may get more flack and grief than you are currently thinking.
I found that liberal arts universities are more accepting. Actually, the more progressive the school is, the less problems you will face. I know in my prior same sex school, you would have been kicked out in a cricket's heartbeat for transitioning. In my current progressive Seminary, I have had NO problems at all.
So, really look into this before jumping the gun. Wearing those cute lil plaid skirts and dress shirts with the other gals may not be as realistic as you think (unless you luck out and find a progressive same sex school.....which is VERY difficult to find)