I'm confused. I won't touch the sunset thing. As that I find was wicked tacky and now with the new sunset can't imagine. But I'm pretty sure you can go topless on any beach on the Dutch or French side. I would use your on discretion and see what's appropriate for the situation. Beach crowd can change daily. It's not an uncommon thing to see bathers topess but then put their top on to swim or go eat. But I'm pretty sure it is not "illegal" to be topless on the Dutch side. Unless I missed something?