birdnesting on bathing suit fabric

I'm getting birdnesting on bathing suit fabric -- I've changed to a knits needle (ball), I've rethreaded a million times and reset the bobbin. My test fabrics, though not bathing suit fabric, all sew just fine. What is it about this fabric and how can I overcome it?

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Reply to
colemanhunt
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Have you thoroughly cleaned the tension disks, as well as the entire thread path?

What happens when you tighten the needle tension?

Reply to
Nanci

Reply to
Liz Megerle

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