What are those tan through bathing suits made out of?

Question

I recently heard of these tan through bathing suits that allows the sun to penetrate through them. I was wondering if this was true and what that material is called? I also want to know where i can get the actual material, NOT THE BATHING SUIT, the material. any help will be apreciated

Answer 1

They are made from the same material that the Emperor had his new clothes made from, in that story.