Part of a two-piece set - “Field of Flowers” (Model 18)
The hat pattern is described here.
For the matching onesie, see Field of Flowers Onesie

This hat has a points sticking out around the top and knitted lace around the edge.

Yardage for both onesie and hat are given with the onesie pattern.

Finished measurements
Head circumference: 14 1/2 (16 1/8) inches