Taking it up a notch, watch how to work a 1 to 5 brioche increase using brioche purl. Brpfyofyof, brioche purl into the front, yarn over, front, yarn over, front is a central (non-leaning) increase method. Like the knit version, this increase is worked over 2 passes (1 brioche row). The first pass (with your MC yarn) creates the new stitches. The second pass (with your CC yarn) gets those new stitches into the brioche format.