I knitted this to demonstrate that a brioche pattern can be converted effectively to standard knitting.
The decreases can be worked normally, but to maintain the twisted stitch effect work them as follows:
Left leaning double decrease: slip 1 purlwise, k2tog, pass slipped stitch over.
Right leaning double decrease: slip1 purlwise, k1, pass slipped stitch over, reorient the next stitch on the left needle by slipping it as if to purl tbl then pass it back to the left needle, …
I knitted this to demonstrate that a brioche pattern can be converted effectively to standard knitting.
The decreases can be worked normally, but to maintain the twisted stitch effect work them as follows:
Left leaning double decrease: slip 1 purlwise, k2tog, pass slipped stitch over.
Right leaning double decrease: slip1 purlwise, k1, pass slipped stitch over, reorient the next stitch on the left needle by slipping it as if to purl tbl then pass it back to the left needle, slip the stitch on the right needle to the left needle and pass the reoriented stitch over it and off the left needle, slip the resulting stitch on the left needle to the right needle.
The reverse side is attractive, but to make the pattern fully reversible all stitches should be knitted through the back loop. Another possibilty is to knit all stitches normally, but in this case the pattern will be less well defined.
Shown with a cast-on count of 23 stitches.