A couple of years ago we saw images of male models in impossibly brief square cut swimming trunks.
No one knew how they achieved this look, it was a completely new design.
some swim suit board members suggested that the pictures had been toucked up.
I did what I usually do in these situations when I don't have an answer, I sat back watched and waited.
Recently a similar design came up on Ebay, I ordered some to see how they are made, they arrived today. The secret is the underside of the rear is thonged achieving the apparently impossible.
maybe I'll try and make my own to this design in swim Lycra.
https://www.ebay.co.uk/itm/226211064...r=525359890656