find any brief or boxer brief that has a 2 layer pouch. the pouch must NOT have any stitching connecting the 2 layers going right down the middle (most do, watch out for this).
From the inside, cut a hole along the top on the inside layer of the underwear. this is now a pocket where you can fit your junk into. Size it appropriately. Generally, start from the waist band and work your way down till its comfortable.
i cut up my h&m "boxers" because i rarely wear them because they ride up a lot... that's why i butchered them into what they are now (check my album)
From the inside, cut a hole along the top on the inside layer of the underwear. this is now a pocket where you can fit your junk into. Size it appropriately. Generally, start from the waist band and work your way down till its comfortable.
i cut up my h&m "boxers" because i rarely wear them because they ride up a lot... that's why i butchered them into what they are now (check my album)