You will need circular needles in US sizes 7, 8, 9 (4.5, 5 ,5.5 mm) for graduated off the shoulder collar.

Finished measurements:
Back Width: 19.5(21.5, 23.5, 25.5, 27.5, 29.25)“ 50(54.5. 60. 64.5. 70. 74.5) cm
Finished Length: 22.25(, 22.25, 23.75, 24.5, 25.5, 26)” 56.5(58, 60.5, 62, 64.5, 66) cm
Sleeve to undearm: 17.75(18, 18, 18.5, 18.5, 18.5) cm 45(45, 47, 47, 47) cm

Yarn used:
Rowan Brushed Fleece
Blue Grotto 272 - 898, 90, 90, 10, 11) balls