Alpaca Kid Lustre Scarf

I wanted a simple project that I could knit whilst a passenger in the car, and vaguely remembered seeing a ripply scarf that looked like a wide vertical rib pattern.

I started with 30 stitches cable cast on, using 4mm needles for this 8ply yarn, then alternated strips of stocking stitch and reverse stocking stitch (5 rows each) for a corrugated effect. Essentially you knit a row, purl a row, then for every 6th row, repeat the previous row.
This scarf took 3 and 1/2 x 50g balls of Alpaca Kid Lustre in Province, 853.