Isabella hat is one of my favorites. It's easy and fast to knit, very stretchy and fits almost everyone. This one went to my husband's goddaughter who turned 11 years earlier this month.
Pattern: Isabella hat by Rilana Riley-Munson (in Ravelry, also available in Finnish)Yarn: Hjertegarn Blend Bamboo, turquoise (731)
Needles: 3 mm and 3½ mm, 40 cm circular needle