How cruel do you want to be?

Moderately so

Regulations should be harder for your students than for the average girl, so you add a couple of extra rules to the college page in the Rulebook.

New Rule: Students undergoing nudity punishments may only spend the minimum amount of time in their rooms necessary. They must remain in public whenever possible, including sleeping. The university will provide outside showers, lavatories and washing facilities to facilitate this and it will be monitored using Wi-Fi-enabled cameras obtainable from the porters' lodge.

New Rule: Students undergoing nudity punishments may not use furniture, such as chairs or beds, without permission.

You read the rules over again and decide that you're satisfied they'll achieve the desired effect. After all, you can change them later if you're unhappy with the results.