This Lop Eared Bunny Hat is very cute.
It is made from the top down in bulky/chunky weight yarn.

Sizes - Head Circumference in inches

0 – 3 Mos 14 - 15
6 – 12 Mos 16 - 17
Toddler 17 - 18
Child 18 - 20
Tween 20 - 22
Adult 21 - 23

Note: Since not everyone’s heads are the size listed for their age group, choose size by head circumference.

This was designed using Bernat Velvet bulky yarn. Other bulky/chunky yarns can be used if gauge can be met.

US size K-10½ (6.5mm) crochet hook or size needed to obtain gauge
Gauge – 11 stitches x 9 rows in half double crochet = 4” x 4”.
Check your gauge. Use size of hook needed to obtain gauge.