i don't know, there obviously has to be some dress code (let's call it "Lex Alcano at the DCC"), but polo shirt and slacks is strict enough imo. i'm watching the wolf's den tourney now and i must assume there's no dress code at all there
First of all, my post is not chiefly about dress code. I make it clear that I'm only referring to what players wear in major competition, so what they wear at the Battle of the Bull is not relevant.
On the other hand, what the players tend to wear in lesser, but streamed, events shows that too many take their self-presentation very lightly and that if you let them wear what they like, they will sometimes embarrass themselves. That is why I favor the strictly enforced dress code at Joss Tour events.
My big problem is that the "bowling shirt like" jerseys that the players are typically wearing at the majors are a big step down from what they might be wearing. If they are allowed to express themselves through tasteful and current fashion choices, it will help pool's image, but they are all dressed the same. Davenport, Rempe, Strickland and several others were always dressed nicely in the latest fashions in their primes, and that includes after they were eliminated.
Pros at golf, tennis, and some other sports take their appearance very seriously both on and off the court, and it has helped their image.
For me, nice slacks and a shirt with a collar should be the minimum at the majors. In pool and in life, people are less inclined to take those having a poor self-image seriously, and being improperly dressed shows a poor self-image.