In summer, it is enough for girls to wear a suitable professional dress. Try to keep up with the season and don't appear abrupt. If it is a dress, you can wear flesh-colored stockings with simple and generous shoes.
Shoes can be decorated, but don't exaggerate, as long as they look harmonious.
For more information about dress etiquette, please refer to: Sichuan Zhonggong Education-Civil Service Examination Network.
If in doubt, please consult the public education enterprises in China.