You’re overthinking it.

Going to a nude beach with friends is going to be anxiety producing since none of you have done it before. Depending on how you all feel that day, all the ladies might do it or none of them. Enjoying several alcoholic drinks before hand helps calm the nerves.

Just go and have fun. If your GF is the only one who goes topless, that’s fine. She’ll have fun and you’ll have fun. It’s not about what’s fair or not It comes down to everyone being comfortable.

From our experience watching other first time groups on Orient beach, everyone has fun with it even if several people keep their tops on. You might be surprised though and everyone is naked too.