I altered the instructions a bit and did something different with the neckline. I did not like the droopiness of the original neckline, so I gathered it with a cord of similar color and added wooden beads to the end of the cord. I like this finished look. Also, this makes the vest easy to get on and off, and I can adjust how taut I want to cinch the top.
I used 4 skeins of Naturally Caron Joy! for the knitted sweater vest. The color is Aquatica (0007). I really like this color blue. This yarn is soft and light, and it blocked so nicely. I used #8 circular needles (28 in.). The vest is made of two rectangles (alternating several rows of garter stitch with a few rows of stockinette) stitched at the sides to create holes for arms and neck.