You will need a large-eyed sewing needle for finishing.

Wool and the Gang also suggests that you use a circular needle for working back and forth on the finishing.

Finished measurements:
Chest circumference: 35.8( 38.6, 42.6, 46.2)“ 45.5( 49, 54, 59) cm
Finished length:20.1( 20.5, 20.9, 21.3)” 51( 52, 53, 54) cm

Yarn used:
Wool and the Gang Feeling Good Yarn
A. 1(1, 2, 2) balls
B. 1 ball for all sizes
C> 3(3, 4, 4) balls