Do these still exist?
I bought one in the mid 90s, the theory behind them that they had a honeycomb weave and let the UV rays through so you didn't get tan lines or white patches.
They had to be 'skintight' to work and no lining material, so the one I had was a garish floral print to make it as opaque as possible for decency.
I don't think they were as good as they claimed TBH.
But are they still out there?