Cecilie Skog hat

Had a ball of yarn left from knitting the Cecilie Skog sweater, so I made this hat.

Note! To make this hat, you need to have the Cecilie Skog sweater pattern.
Yarn: 1 of Kos from Sandnes Garn, Color 7270
Size: Large
Cast on 90 stitches on 5,5 mm needles.
Knit 1, purl 1 in the round, 5 inch.
Knit 1 round.
Start knitting the three pattern from the book, adding an extra stitch between each three stem.
Knit until the length of the hat is 9 inches.
Decrease as follows:
Knit 6, knit 2 together. Repeat.
Knit 1 round.
Knit 5, knit 2 together. Repeat.
and so on.
Knit 2 and 2 together on the last round.
Weave in ends.