I’m not sure how to answer your question. After the original cast on of 3 sts you repeat (k1, k2tog tbl, slip those 2 sts to left needle). I ended with the slipping 2 to left needle and started with a purl row.
Cast on 3, k1, k2tog tbl, slip 2 sts to left needle, k1, k2tog, sl 2 sts to left needle, k1, k2tog, sl 2 sts to left needle and so on.
Does that help?
Please rewrite it to make it work. If what I’m posting doesn’t clear it up I can try again.
I used the k2tog bind off because it is stretchy and I wanted to compare the stretch of the cast on to the bind off. I knew it was stretchy but was surprised it beat out the bind off. Full disclosure: I didn’t do k2tog tbl on the bind off. Someone on another site was asking for help on a top down tee and this was the cast on for the front neck to join to the other shoulder as I understood the problem. It would make a nice detail on a neckline I think.
Looking back at the photos, the cast on is on the bottom in the ones with stockinette. I should have pointed that out. I’m wondering if I created confusion as to which edge is the cast on.
I’ve gotten so much help and learned so much from you. If this is something you like and I passed it along I’ll be walking on air!