|I recently sewed a full, fluid skirt in a poly lycra knit. When the pattern called for a narrow hem along the bottom of the skirt, I was not looking forward to it! I wanted to be sure I did not ruin the beautiful drape of the skirt and the fabric. Using a fusible or sew-in bias tape on a test scrap resulted in too much stiffness. So, I tossed the bias tape idea, set my sewing machine to a regular zig-zag stitch, adjusted the lower tension so the stitch wouldn't "tunnel", and sewed a scant 1/4-inch from the bottom of the skirt. I then pressed this stitching flat using a warm iron, and found this line of zig-zag stitching gave me just enough control of the fabric to be able to roll over a 1/4 inch hem (single fold), press it lightly, and stitch it down using the same zig-zag stitch. It worked great. The hem drapes beautifully, the zig-zag stitching accomodates the stretch of the fabric, and I didn't have to use any other notions but thread to make it work. Next time you have to sew a narrow hem on a knit, try this out. Test a scrap first to get the correct lower thread tension (and perhaps the stitch length and width - I used a 3 width and 4 length) to avoid tunneling the fabirc and remember to press lightly (knits can scorch!).