see this blog post for more information.
This is not squishy brioche; it's one column of brioche alternating with one column of garter stitch, and this makes it paradoxically flat.
Shown with a cast-on count of 5 stitches.
1 2 3 4 5 Horizontal repeats
1 2 3 4 5 Vertical repeats
Swatch photo uploaded by Gannet