The hat/trouser pattern is listed separately as it uses a different weight of yarn & gauge.

Aran Sweater: Mandarin Fiesta (200 - 350 g)
Trousers: Mandarin Petit (150 - 250 g)
Hat: Mandarin Petit (2 x 50 g)

Pattern in Norwegian. A Finnish translation of the pattern was published in Moda 4/2007 (pattern #27).