The Brioche Stitch is a member of the rib family of knitting stitches but the end result has more stretch and give in it. The key to this stitch is a combination of slip stitch and yarn over.
Some brioche patterns refer to a knit two together (k2tog), but some use the abbreviation brk. Both however refer to the same procedure, i.e.knitting the slipped stitch and its neighboring yarnover together. The brk abbreviation refers to brioche knit.
Instructions-Cast on an even number of stitches, plus 2 edge stitches if wished-see below.
Row 1,Set up row- *slip 1 knit wise, yarnover needle, K1* rep. to end. Because the yarnovers will always be knitted with the slipped stitch right next to them, you aren't really increasing stitches.
Row 2,The second row forms the pattern and is worked throughout.*slip 1 knit wise, yarnover needle,K the slipped st. and yo together (k2tog or brk) rep from * to last slipped st.and yo from previous row, Ktog.
Just repeat row 2 for the length of your project. The stitch pattern becomes intuitive as you get to understand it. Remember that the yarnover is never its own stitch but is always worked with its slipped stitch neighbour.
The basic brioche stitch pattern is worked with an even number of stitches.However if you are making a scarf or a blanket, you might like to add an edge or selvedge stitch to each side.This gives a more finished look to your edge. Cast on 2 extra stitches and then slip the first stitch of each row knit wise before starting the brioche pattern. You will then have one extra stitch at the end of each row that you will knit. Just be sure to remember that the slipped stitch at the start of each row is not part of the pattern.