You will need a circular needle size US 3 (3.25 mm) at least 32" (80 cm) long. ** Instructions are given for two lengths. The measurements for the finished length of the shorter size contains typos - below, the measurements are more in keeping with the original design. ** Finished measurements: Bust circumference - 36.5(41.25, 44.5, 49, 52.25)" 93(104.5, 113, 124.5, 133) cm Finished length (short) 26(26.75, 27.5, 28.5, 29.5)" 66(68, 70, 72, 74) cm Finished length (long): 33.75(34.75, 35.5, 36.25, 37)" 86(88, 90, 92, 94) cm Yarn used: Rowan Cotton Glace Shade 726 Bleached for both versions; Shorter version: 10(10, 11, 11, 12) balls Longer version: 12(13, 13, 14, 14) balls Yarn Weight: Sport (12 wpi) Gauge: 38 stitches and 34 rows = 4 inches in Ribbed pattern Needle Size: US 3 - 3.25 mm Yardage: 1250 - 1750 yards (1143 - 1600 m)