Students' union generally doesn't have too many requirements for girls' high heels, as long as they are barefoot black dress shoes. The heel height is selected according to your ability to control high heels. If you haven't worn high heels before, it is recommended to choose a middle heel of about 5 cm first, and then increase the height after a period of adaptation, while 7- 10 cm high heels will look better. I hope high heels will bring you beauty and confidence!