It appears the Aronikswim suits are unlined, using a thin stretch fabric allows the suit to mould itself over one's parts giving the attraction that draws the eye, which is why you like it.
You also like sungas and this swim suit is more sunga than square cut. If you look at the Salvation Brief you'll notice the shaping is almost the same. They've taken the smooth front bikini design (racing brief) and lengthened the sides and widened the crotch until they appear as legs.
Square cuts are 4 panel swim suits, allowing for the formation of a pouch at the front. The Aronikswim square is half smooth front bikini, half sunga and half square cut.
I have the Swimboy patterns and could try to merge them for this project, what size are you ?
ps do you like this ?
https://www.aussiebum.com/mens/swimw...pics-navy/4502