Soucy: "A pullover vest for children, written for worsted weight yarn at a gauge of 18 stitches to 4 inches. Worked bottom up in the round to the armholes, then front and back are worked separately to the shoulders, which are bound off together. Great for girls or boys! Sizes 2, 4, 6, and 8. Yarn shown is Lorna's Laces Shepherd Worsted."
(All this means no sewing, of course, and this lovely simple design works with absolutely any style of yarn that meets gauge-- Ed.)