There are many types of sewing stitches used in knitting. Mostly sewing stitches are used when finishing garments, to sew seams together, or as a decorative element. The whip stitch is one of the easiest sewing stitches to learn.
The whip stitch can be used to sew together two pieces of knit fabric, or it can be used as a decorative edging on a single piece of knitted fabric.
How to sew a whip stitch
knitting fabric (either one piece or two)
First, if sewing a seam, hold two pieces of knitting with the right sides facing each other.
Setup: thread tapestry needle with yarn tail and bring needle to RS of top piece just inside the edges at right end.
Repeat: *Going over edge of top piece. Go up under a stitch bump on the bottom piece, with the needle going toward the top piece. Bring needle through top piece to RS directly above the stitch bump of bottom piece. Rep from * to end.
Finishing: Pull stitches snug to bring top piece edge to stitch bump.