He used to wear what is called a 'snapback', which has a wider peak than a baseball cap and no curve to it.
The one he is currently wearing is a variation i.e. same wide peak with a small curvature.
He's the kind of unfortunate guy that might not look too in anything, but that hat and an orange shirt didn't help, particularly if they switched to Scottie looking all-black svelte wearing shades and a traditional black Titleist.