The scarf is not part of the pattern, it is a fabric scarf.
The sweater has five tabs around the neckline through which various scarves can be pulled and draped to get a different look.

UK crochet terms are used.

Yarn:
10 oz. 3-ply wool.

Measurements:
Shoulder to lower edge, 19 inches.
Round pullover below armholes, 34 inches.
Sleeve seam, 18 inches.