I used the K-sized crochet hook and the left over Red Heart yarn from my koala and sheep. I really liked that Yarnpirations had a video that I could follow along when I needed it. It was simpler than I had thought it would be but I think that is because I was able to watch the video to see it being done.
Since I was using left over yarn, the collar is only 9 stitches wide. The collar is sort of awkward size, if I had it to redo, I probably would have used 6 or 7 slip stitches. 9 stitches does not fold over as nicely. I guess I can always hand stitch the “corners” of the neckline down to get a nicely folded collar. Also, the sides are only 4 slip stitches wide.