Luigi
Mickey Mouse wears the sorcerer's hat in the movie "Fantasia".
Powder
no thats Oriste
His brain is exposed under there
Cookie from Beetle Bailey by Mort Walker
He always wears his hat because it's awesome, but took it off a few times. :)
The Hamburglar on McDonaldland is a short child-height character who wears a black and white striped shirt and pants and a black hat. He is also wears a black cape with yellow on the inside.
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.
Get your electronics gear aligned properly! You may be thinking of Amelia, who is almost certainly lost fatally in the movie version. The title character wears a (Flapper) floppy hat in some scenes, but it is not really an occult film.
He wears black hats more than white.
Jiminy Cricket