|slip stitch rib|
Cast on a multiple of 3 sts.
Row 1: *P2, ytb, pick up 1 (pick up loop lying between needles, then knit it in the usual way), k1, rep from * to end.
Row 2: *P1, sl 1pw, ytb, k2, psso, ytf, rep from * to end.
These two rows form the pattern.
I suggest using fairly loose tension with this stitch. It tends to pull to one side otherwise. Nothing you can't straighten out with a fair bit of blocking. Enjoy!