I can assure you Zeno that what you are hearing from the Tourist Board is not true. My source of information is the Gendarmes and the French government. There is no law against nudity on any part of Orient and no one has ever been fined. There is a long standing tradition of C/O use on Orient.
It is true that some cruise companies have tried to influence the Gendarmes to restrict use to both the the south and north ends. This happens about one hour each year.
Whether or not you believe me is not relevant. What is important is that people know what to expect when they get there. On this we agree. Be prepared to see nudity everywhere on the beach, and feel free to wear what you want anywhere on the beach.