Just a basic hat I made for my husband, because he likes it just really a simple one. He doesn’t like big ribbing, so I make it in 1x1 ribbing, and then just stockinette stitch until the end.
Super easy to make!

Size
One size to fit 52-56 cm head circumference
Length from brim to top about 20 cm

Needles
3.5 mm circular needle (at least 40 cm long) or dpns, or appropriate size to get gauge.
3.00 mm circular needle (at least 40 cm long) and dpns, or 0.5 mm smaller than the gauge needle.

Other
stitch marker, tapestry needle for weaving.

Gauge
20 sts and 30 rnds in 10 cm in stockinette stitch worked in round with needle 3.5 mm. Take time to save time and check your gauge. Adjust needle size if necessary to obtain the correct gauge.