beret ( pronounced brrr-ay)
halo
Luigi
Huckleberry hound
A maid typically wears a uniform with a cap known as a "maid cap" or a "maid hat." It is usually white and has a simple design to complement the maid's uniform.
Alabama's groundhog Smith Lake Jake
It is described as a "1940's fedora".
Cookie from Beetle Bailey by Mort Walker
the only one i can think of with a white hat at the top of my head is Makarov, and he is the Fairy Tail Guild Master. Juvia's second costume has a white hat. Gajeel wears a white hat (I think) when he creates new songs (that sound terrible) and performs them.
ortise
a jewish hat
Yes he wears a cowboy hat
He wears a hat because he is a gimp