You will need a cable needle.

You will also need a size US 3 (3.25 mm) circular needle, no longer than 16” (40 cm).

Finished measurements:
Chest circumference: 35.5( 39.75, 43.25, 47.75, 51.25, 55.5, 59, 63.5)“ 90( 101, 110, 121, 130, 141, 150, 161) cm
Finished length: 23.25( 24, 24.75, 25.5, 26.5, 27.25, 28, 28.75)” 59(61, 63, 65, 67, 69, 71, 73) cm

Yarn used:
Rowan Softyak DK
Shade 255 Albany - 6(7, 7, 8, 9, 10, 11, 11) balls