It's a minion hat! I made it for a child but it turned out an adult size. I am going to make it again and down-size the hooks I use. This pattern is easy and fun to make. The pattern is available on this Ravelry page. There are numerous sizes included in the pattern and an assortment of looks to choose from. I'll be making another one of these soon.
Take care and have fun!
More Minion socks