You will need a size US 2/3 (3.0 mm) circular needle no more than 16” long for the neckline.

Finished measurements:
Back width: 22(23.75, 26, 28, 30)“ 56(60.5, 66, 71, 76) cm
Back width - sleeve end to end: 30(31.754, 33.75, 35.75, 37.75)” 76(80.5, 86, 91,96) cm
Finished length: 19.5(20, 20.75, 21.25, 21.75)“ 49.5(51, 52.5, 54,55.5) cm