Hello friends. I'm going to the Belmont next weekend. Should I get a hat?

Pros: Hats are fun.

Cons: I have a tiny head, do not own any hats.

So should I buy one? I don't even know where to begin. I'm wearing a yellow dress and would like to look like this but am pretty sure that is not what a Derby-type hat is all about.

Anybody fancier than me want to give me hat advice? I also don't want to spend more than like 75$ on a hat (and if I spend that much it better make me look like a damn fox.)