The most common seaming stitch is called mattress stitch. With the right sides facing, it is worked 1 stitch in from the edges by working alternately from 1 side, then the other, 1 row at a time. A yarn needle is used to pick up the yarn strand going across the width of the knitted fabric between the 2 edge stitches of each row. It is pulled tightly enough to match the stretchiness of the fabric and create an almost invisible seam.