This stitch produces a very tight fabric so I suggest that you use a size bigger needles than you normally would for the yarn you are going to use. Herringbone stitch will make a very warm garment or a lovely handbag. It also uses a fair amount more yarn than stocking stitch would.
You will need:
Yarn of your choice
Knitting needles a size bigger than recommended to suite your yarn
C/on cast on
C/off cast off
P2tog purl the next 2 stitches together
Psso pass the slipped stitch over
S1 slip the next stitch purl wise
C/on an even number of stitches
Row1: K1; (S1, K1, psso – knitting through the back of the stitch at the same time) repeat to last st; K1
Row 2: P2tog and keep on left needle, P the 1st stitch again and then drop both stitches off the needle together.
Rows 1 and 2 form the pattern; repeat until you reach your required length.