Mostly an unruly mess of very gray hair. I've just never gotten into the ball cap habit, but usually wear one for yardwork in the sun, or in my shop when making a lot of saw or router dust. Out and about in summer sun, usually an old tan or blue "sailor". For winter cold, a plain knit "stocking cap", with jacket hood added for worst case days.
There is a cowpoke style straw in the closet that I got when we rode mules down the Grand Canyon a few years ago, but I seldom put it on.