Most high viz shirts have the company logo and the name of the individual on them. If people are truly being offensive (as opposed to just wearing high-viz) I would imagine that a letter to the CEO citing the date, time, and perhaps even names of the people and suggesting that the company's reputation is being sullied would have quite an effect.
One of my employees was reported to me for being rude to staff and drunk (not in a lounge, but in our local bar). He is no longer with us.
I assume your employee is "no longer with you" for the said reasons you have implied (and not other reasons, or
primarily for other reasons).
I actually think that's a great idea, though suffice to say many people will not do this, and I'd say even less CEOs / line managers will take it on board (present company excepted, who seems to set a fine example of enforcing a particular standard).
Qantas Club rules state attire must be neat and respectable. People in singlets, thongs and hi-viz jackets are not, IMHO, neat and respectable.
No thongs? Ha! You're going to be a riot with everyone who uses the QP when they go for holidays or non-work purposes. (Not me - I always travel in shoes - work or holiday).
Fundamentally I don't have an issue with hi-viz in the lounge. Hi-viz does not make the bad patron. That said, if you do enter a lounge, of course make sure that even if you are in hi-viz, you are fairly decent. If your hi-viz is dirty, change it.
It's down to 'do unto others' here. I still believe QF should enforce a policy of people being respectful, quiet and at least know what deodorant is.
I wonder how would QF (indeed, any company that owns a premises of sorts) enforce such a policy. It could easily backfire on QF through media channels (read: "Man Oppressed by Qantas for being a regular Aussie" or something along that tripe); it's very, very easy to accuse QF of being prejudicial / biased / "un-Australian"
or what not and QF will never have a right of reply (or at least people will never believe QF).
I do agree that QF should enforce a standard in the lounges, but I just don't see how they can do it. This is not like a nightclub where bouncers can be sent in and literally toss people out the door and onto the street as they see fit, with a good kick in the backside for the road.