The vest takes 2 different colors of Homespun:
23,3,3,4 skeins (A) and 23,3,3,3 skeins (B)

You will need double-pointed size 8 needles
There are no buttons required.

Applied I-Cord is worked around the entire edge - including armholes. It is applied after the vest is completely knitted and assembled. (This is why you need the double-pointed needles.)