PN/Tell them you are naked
From Create Your Own Story
Your face turns red as you answer, "Well actually, I kinda am naked."
They all go wide-eyed and Katie asks, "What!? Girl no you aren't, I don't believe you."
"I really am, why do you think I ran to my towel when you called my name?" You answer.
Angel asks, "Well that means you were okay with everyone else seeing you naked then. Plus, why would you be naked in public in the first place?"
You could say that you lost your bikini in the pool. This would make them think you're not doing it on purpose. You could say you lost a bet. They would know you chose to be naked, but maybe not by your choice. You could admit that you wanted to do it. Just be honest and tell them you wanted to be naked at the pool.