Taken from 101 Crochet One Skein Wonders: "This adorable sweater will fit your daughter's favorite 18-inch doll- or your own favorite doll! Using only single and double crochet with chain stitches, both pieces are crocheted from the top down."
This pattern is from 101 Crochet One Skein Wonders, pg 80 - Rainbow Doll Sweater.
Size D crochet hook (or size needed to obtain gauge), two buttons, and a tapestry needle are required but not included.