You will need a cable needle.

Finished measurements:
Back: 14(15, 15.5, 17, 18)“ 35(37.5, 39.5, 43, 46) cm
Length: 16.5(18, 19.5, 21.5, 22.5)” 42(46, 50, 54, 57) cm
Sleeve: 10(12, 13.5, 15, 17)“ 26(30, 34, 38, 43) cm
Sleeve cap: 3(3, 3.5, 3.5, 4)” 7.5(8, 9, 9.5, 10) cm

Yarn used:
Rowan Softyak DK
A. Driftwood 244 - 4(5, 6, 7, 8) balls
B. Pampas 235 - 1(1, 2, 2, 2) balls