Voyager EMH
Slipper Wearing Plucker of Pheasants
I've done that in Australia, but not the sandals. I wore trainers like many others seemed to be doing. This was in the 1990s. My summer golf shoes (Footjoy) are trainers now.It took me 35 years to join a golf club because I thought they were all stuffy places full of reactionaries and I could think of better places to spend my chilling out time.
Thankfully I eventually discovered that those kind of clubs are just a noisy minority and are easily avoided.
If you’ve never tried it, when it’s hot I can really recommend playing golf in a t-shirt, athletic shorts and sandals.
Saw a few in what we would call a "vest" or sleeveless top.
I really saw no difference in terms of the playing and enjoying golf, the general behaviour and etiquette, respect of the club and the course.
All very similar people playing and enjoying golf on the other side of the world.
But the almost total absence of the "stuffy" attitudes that you very accurately describe.
I think wearing no shirt was not allowed.