Picking the right sewing machine needles when sewing knits are crucial for the end result. Using needles made for stretch fabrics will prevent both skipped stitches and holes that won't heal. Sewing machines, sergers and coverstitch machines have their own set of needle system for knits.
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I got a knit fabric and my machine seems hell bent on not sewing it. I can sew a piece of flannel so I know everything is threaded right,needles not dull, etc
Guide to sewing machine needles for knits - The Last Stitch