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@lurker172602 wrote:
It has pulled it tighter, like gathering. It's almost as if the fabric has deformed. Do you think the elastin (or whatever it is) may have failed in some way?

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I want to see a photo  😄  

Did you unpick the hem or trim it off?

It could be stretching of the fabric.  Does it have a tightly rolled overlocked hem or is it turned under and stitched?