This hat pattern is worked up in five sizes: 12.5, 14.25, 18, 21, 23 inches in diameter. Knitted in worsted weight yarn, it works up in a matter of hours and makes a great last minute gift. Knit a smaller size for a skull cap or knit a standard fit for a ‘watchman cap’ style. Add rows where the pattern indicates in order to add height and make a taller hat.