Still working on the built-in cockring brief build.
This version is a circle sew in the middle of the panel, two layers then turned out. Then an elastic band inserted in the seam allowance.
It came ok, still need to come up with a better technique for his make fo underwear.
Did the first test on woven fabric (brown/purple), then some yellow teeshirt material. The tee shirt fabric has a good stretch in one way, but very little on another way.