My DS has always hated things on his head. As a newborn he'd scream bloody murder if we put a hat or hood on him and once he was old enough to pull it off, he'd do it.
Earlier this year (February) we went on holidays to the beach. I was constantly dousing him in sunblock because he refused to keep his hat on. He'd rip it off, throw it on the floor and then stamp on it. (Determined little bugger is my son.
Anyway, take heart. He'll be 2 in just a week's time and in the last month or so has actually WANTED to put his hat on. DH and I have always led by example and worn our hats out in the sun, or our warm winter hats out in the cold, and I think it's finally catching on. (hooray!!)
Just persist with the hat and hope that he develops a "hat-wearing fettish" really soon.
I was so shocked when my son put the hat on by himself when we were going out one morning.
DH - 36
DS - Henry (AKA: Bub-ling) Born on his due date 04/09/03