Description from Knitty.com:

This pullover has been my standard, fall-winter-casual-wear sweater for three years. Knit it in a durable, classic yarn, and it will become your default sweater for cold weather, too - casual, cozy, easy to wear, and a cinch to knit up in bulky yarn.

Because it's designed with a lot of ease, only two sizes are given. On a person of average build, there will be about 12 to 16 inches of ease; you can knit it with less ease, if you wish.