i just answered this, and my post disappeared after I submitted it!
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First thing, use a ball point, not a regular tipped needle. Â Also, do not use a straight stitch. Â If your machine has a "stretch stitch," use that. Â If not, set a zigzag stitch that is barely a zigzag, with a short stitich width and slightly longer stitch length. Â Those two things should enable you to sew jersey without trouble. Â You don't NEED a special foot. However, if you happen to have a "walking foot," use that; it will feed both layers perfectly together and makes sewing any kind of knits easy as pie. Â Like I said, a ball point needle, a stretch or slight zigzag stitch, and a regular foot will do the job just fine, though. Â Good luck!