You will need a cable needle.

Finished measurements:
Chest circumference: 25.5(27.5, 29.75, 32, 34 )“ 64.5( 70, 75.5, 81, 86.5) cm
Finished length: 16.25* 17.25, 19.25, 20.75, 22)” 41(45, 49, 53, 56) cm
Sleeve length: 9.5( 11.5, 12.5, 14.75, 16.75)“ 24(29.5, 32, 37.5, 42.5) cm

Yarn used:
Rowan Softyak DK
Shown in shades 254 Canopy on the boy and 247 Shell on the girl.
5(6, 6, 7, 7) balls