From the pattern description: You’ll give an otherwise dull (or overworn) shirt a new life when you throw this Scoop Neck Vest on top. It’s sized to be formfitting, so if you prefer a looser fit, knit the next size up. In the interest of speed, the vest is knit in the round until you reach the armholes, then the front and back are worked separately. This pattern fits a small woman (32-inch chest). Directions to fit chest sizes 34, 36, 38, and 40 inches are in parentheses.