When "Charlie" is first introduced to the class, she struts down the aisle in heels. When she follows Maverick into the building, you can briefly see that she is wearing flats to compensate for Maverick's short stature.
The MiGs in the movie are actually all Northrop F-5E Tiger II's, an American plane that it uses as a trainer and sells to other countries. In reality, there is no MiG-28. It is just an F-5E.