Has anyone actually been expelled from a club because they couldn't keep their shirt tucked in?
60% of Australians are overweight, 30% are obese, 100,000 australians every year get told they have type 2 diabetes. Australians spend 1 Billion dollars every year on weight loss programs. Unless we go back to living in caves humans are only going to get fatter and fatter. These increases in poor health are also now being seen in developing countries that are being introduced to Western foods and lifestyles.
If a golf club wishes to alienate players for having their shirts untucked that golf club will be drawing potential members from a smaller and smaller pool every year. Good luck to them.