Catholic casual is definitely the style at my church - when I was in confirmation classes I usually was dressed up because I had to book it to work right afterwards, and I always felt out of place.
However, people who cannot look decent for a funeral annoy me to no end. At GPBoy's funeral somebody came wearing OVERALLS. Could they have not taken 5 seconds to at least put on a jeans and a collared shirt before riding their tractor to the services?