I don't have see-thro' trunks, of any make, but I do have tan-thro' ones, made and sold by Kiniki. They are made from a very fine mesh, which with the dark colour scheme makes them opaque to view while letting the UV in.
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I had a light blue small speedo-like swim suit for awile. I became pretty see thru when wet. You could see the outline of me penis pretty good and it rode up my ass. Got some smiles when I wore it to the non nude beach. One guy asked me where I got it. He wanted one too.