I tried repairing another brief suit that was not in as bad a shape as the first one, I cut a chunk out of the rear with a center seam, and then cinched it up a bit by taking a tuck in the perineum area and cutting out a couple inches of leftover cloth. The combination of the two adjustments cinches everything up a bit. I am wearing the suit now and can feel it pushing up a little in the perineum area, and, interestingly, I can also feel the butt seam pushing inward, much like a thong. This is a better fit all around than the first one I tried.
Next up, I tried repairing a swim thong from the same material and from the same company as the brief, above. This has no space for a string tie and the waist elastic was completely stretched out. I knew several inches had to come out of the waistband. I started out by cutting each side and doing an overlap seam to reconnect. My first attempt and I had one side inside out. I finally cut out the overlaps, straightened out the mismatch problem, and just did a zig zag stitch to hold the butt edges together. That worked tho I didn't get the edges perfectly even...
The next step was to take excess fabric out of the pouch. I did that with the same type of stretch seam I used on the butts of the briefs, but followed the original pouch shape except maybe an inch or so inside. Thus I ended up with a new center front seam and a smaller, not as stretched out, pouch.
Finally, the thong needed to fit way snugger in the perineum area. That will also pull the rear strap more tightly between the butt cheeks and in general make look and feel better. So I cut a couple inches out of where the front is attached to the back, the front now being narrower than before because of the pouch seam.
I made all these adjustments without trying the thong on as I worked. I was worried that I may have made the waistband too small, but when I tried on the finished product, the revamped waistband turned out to be a perfect fit. The pouch seems right-sized, and best of all, the thong back cinches up between my butt cheeks very snugly, with some of that really nice-feeling upward pressure on the perineum as well. My sewing flubs here and there aren't really noticeable once it is on.
How did I do on remaking the stretched out the thong? Well as soon as I got into it I started precumming profusely, so my body says the sewing work must be at least OK :-)
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I'm wearing the last brief I did right now. I really like how the butt-seam I made makes it feel much like I am just wearing a thong. I need to do my rowing and cycling for the day, and I will see how it goes.
Sebbie