The hat is worked bottom up.
At the crown, the stitches are divided in 4, with decreases before and after marker stitches.

Size One-Size
Measurements
Entire length: 36 cm.
With fold: 24-25 cm
Yarn Sunday from Sandnes garn (100% wool)
Tynn Silk Mohair from Sandnes garn (57% mohair, 28% silk, 15% wool)
Alternatively:
Arwetta Classic from Filcolana (80% superwash merino, 20% nylon)
Tilia from Filcolana (70% kid mohair, 30% silke)
Yarn quantity 100 g Sunday or Arwetta and 25 gram Tynn Silk Mohair or Tilia.
Suggested needles Short 4 mm circular needle, 40 cm. Change to double-pointed needle or magic loop when you have too few stitches.
Gauge 25 stitches in rib with k3, p2 = 10 cm