I definitely need to learn something from this thread. During the summer afternoons, we get lots of rain. I carry a rain suit, (pants and long sleeve coat), FJ rain gloves I don't feel help much, a huge Mizuno umbrella. I also have the typical snap on cover for my bag, which I spray with Thompson's Water Seal every season.
None the less, I never seem to feel prepared and if it rains on the course, I usually just go back to the clubhouse and either wait it out or quit. Somehow, I always seem to get wet, no matter what I do.