Great question!
In most cases, when he's playing somewhere the weather is a factor, jackets and rain pants are part of the scripting. In this particular case, no weather apparel was scripted.
This season's fall apparel line is hitting retailers this month, and there are a couple jackets that are a part of the line. Very strong possibility he will wear one of those jackets at the Open.
I say "jackets", but it's really more of a cover up. They are quite nice. I'll ring a picture to post.

