Texas is hot as sh#@, and this is a question I have been looking to solve for a while.
Baseball hats are OK in a pinch, but are worthless for ears & necks.
One of the better solutions is a white cowboy hat. They can be found with a vintilated crown, which is very helpful. I like white because that color does not cook your mellon as much in the bright sun. They are not much good in wind - most do not have a chin strap. Since you're in Texas, a cowboy hat isn't out of place.
I have been looking for a straw or woven-grass Panama hat, but I have yet to find one I like better than a cheap cowboy hat. A good Panama hat can get rather spendy.
There are often wide-brimmed hats in garden stores. Some of these have come close to what I am looking for in a Panama hat, but not close enough. You may find exactly what you're looking for, though.
I have combined a length of cloth with a baseball cap. Once I went afeild for a few days wtihout a proper hat and used a white terry hand towel under a baseball cap to cover my neck & ears. I looked goofy, but saved my from burning badly.
Filson offers an excellent wide-brimmed hat. Unfortunatly, their "Tin cloth" hat is not the best choice for sun and heat. It does not breathe, and it is dark. It will shed water in the rain, and it has a very wide brim.
On Edit - Filson has a new, white
Packer Hat. This would be an excellent hat for sun & heat. I may have to order one.