Hansel's Hat

When my daughter in law's cat was in intensive care and had to have most of his hair shaved for IV's and procedures, my son asked if I would make a sweater for him. Getting some crude measurements, I cast on what I thought would be enough stitches and started knitting a knit 2, purl 2 ribbing. About the time I got to the point of figuring out leg holes, Hansel died. The sweater sat unfinished for some time, but today I figured I should make it into a hat, as all it needed was the top decreases. Hopefully it will fit my daughter in law, if not, I will donate it to some charity.
Needles: Size 9, 15 inch circular and double point.
Yarn: Homespun