Ca Rio Ca are a Brazilian brand that make sangas:
https://cariocawear.com/collections/...sunga/Superfit
Sangas are halfway between a speedo style swim brief and a square cut swimming trunk. The legs of sangas is square but usually the crotch is lower than the legs of the suit. On square cuts the legs usually are longer than the crotch. The open legs of a swim brief are cut away in an upward curve around the sides.
You cannot tell from a photo of a dry swim suit whether it is unlined, has a just a front lining or is fully lined, the lining is carefully secured in the waist and leg seams.
On Ca Rio Ca's home page there is a photo of 2 guys in wet black sangas, the detail at the front of the suits suggest they are unlined or very thinly lined but I would need to see more photos to be certain.
They are the models in a video.
Many of their products say fully lined in descriptions.