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And yes, as @Brain-Stew suggests, if you can find black lycra (‘warp knit’ so ideally can be left raw-edge and not ladder), to apply a big panel on inside and stabilise
Use Bondaweb hot-melt film to hold in place, before zig-zag stitching to allow stretch/movement of the stitch. Good luck!
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I mean, I'm sure this is the best way to do it, but even a cack-handed numpty like me can manage a coarse running stitch like below, which has kept the "arse crack of doom" from seeing the light of day for a few more years. So don't let the description above put you off taking up a home repair. No offence intended @Chopsicle!
Is there anything you can do with bibs when they have gone see through?
I have a pair of Rwanda national team bibs that i got whilst over there and are irreplaceable, but have seen a bit too much use now.