The yarn must be soft and can be cotton or wool. Hook size must be slightly bigger than recommended to maintain soft feel.
I used hook 3.5 mm
pattern
9 hdc into magic ring
1-15 rows : 1 hdc×9 ( 9hdc)
16 row : 1inc ×9 ( 18 hdc)
17 row: 1 hdc, 1 inc×9 ( 27 hdc)
18 row: 2 hdc, 1 inc ×9 ( 36 hdc)
19 row: 3 hdc, 1 inc×9 ( 45 hdc)