The loss of some fabric from my Pactimo bib knickers has led to a situation where the fabric at my upper butt area is now transparent enough to elicit an "EWW!" reaction from my riding peers.

These bibs are still serviceable otherwise.

What ideas do folks have on how to sew in a panel to block this transparency? I thought of asking my girlfriend to sew in a piece of terrycloth towel into the interior to block this and also absorb sweat. I just don't know enough about sewing stitches and I would think that Lycra might require an elastic thread and some type of zig zag stitch.