Finishing Techniques for Knit Fabric. It’s really important with knit to use the right needles. If you don’t, you end up with these lovely little holes along the the seam line . Use stretch or ball point needles! Also, a walking foot can be so helpful when sewing knits, especially if you’re using a sewing machine. Examples of sewing machine finishes From top to bottom: stretch stitch, zig zag, overlock stitch and a double needle. No serger is NOT an excuse for not sewing knits.