What do nuns wear for shoes or do they wear any at all?

Nuns wear different things depending on the customs of their particular community. I am a teacher and it would be quite inappropriate for me to show up to school with no shoes on, with high-heeled shoes, or expensive shoes. Some nuns are dedicated to works of penance or have a special spirit of simplicity etc. It would be appropriate and virtuous for them to not wear shoes if that is their communities tradition.