Textured braid

 Cast on a number of stitches that is a multiple of 12 + 3 stitches.
Rows 1, 3, 5, 9, 11, and 13 on the right side are knitted as follows: 3 purl stitches, *9 knit stitches, 3 purl stitches, repeat from *
Rows 2, 4, 6, 8, 10, 12, 14 (wrong side): 3 knit stitches, *9 purl stitches, 3 knit stitches, repeat from *
Row 7: 3 purl stitches, slip 3 stitches onto the 1st additional needle behind the work, slip the next 3 stitches onto the 2nd additional needle in front of the work, knit 3 knit stitches from the left needle, then 3 knit stitches from the 2nd additional needle, then 3 knit stitches from the 1st additional needle, 3 purl stitches, repeat from *
Repeat from rows 1 to 14