I have a boonie hat similar to this
The brim is floppy so if it’s windy, it blows up and doesn’t shade my eyes
So, I got some stiffener similar to this:
Then I cut that into a shape like the brim to a ball cap. And some black fabric. And sewed it onto the bottom of my boonie brim:

One trick is to cut it wider, like this red line:

And then when I sew it to the hat, pull it in. Then the front of the brim will be pulled down so I get better sun protection.
I know, that red line is pathetic. Maybe to the point you don’t understand what I’m talking about. I need something better than paint and my mouse.
I’ve been trying to solve this problem for years. Making various versions of a hat from scratch. Nothing has been comfortable and effective. This has worked pretty good on a number of windy trips.

