To make the vest you need about 12 ounces yellow and 6 ounces brown worsted yarn.
For size 34-36 use F hook. Gauge is 9 sc equals 2 inches.
For size 38-40 use G hook. Gauge is 8 sc equals 2 inches.
For size 42-44 use I hook. Gauge is 7 sc equals 2 inches.