(thank you
@puchu for trying to drag this back on topic!)
I think the last few pages of debate about various people's ideas of "acceptable standards" (and how much they can vary) illustrates a broader point that I've been trying to find a way to put across Basically the notion of "society norms" or "community standards" (as opposed to personal ones).
The vast majority of us are raised to be members of our societies to at least a base degree. Yes, various things like religious views, personal/family morals, upbringing, experiences, cultural beliefs etc will have their own effects on his but most people in so-called "civilised" societies - for better or worse - agree to base levels of acceptable forms of behaviour which includes dress standards. Of course, not everyone agrees, and their will be those who are on the fringe in various ways. And those who don't give a crud about any of it and do their own thing - to various degrees of acceptance.
So anyway, in terms of what is "acceptable" in public, and places like airline lounges (to try to keep this vaguely on topic) more or less rely on those shared cultural or societal "norms" that the majority accept (plus when certain places decree dress codes of course). Of course this varies where one is - not only within a society (for example, what would be generally OK on the beach probably would be frowned upon in an airport lounge) - but also differ by location (more conservative cultures and countries having far different rules and expectations on appropriate standards of wear and behaviour).
Regardless of "outliers" I think most people have a general sense of what is OK in public settings. Clearly some people's views will differ (ie is that teenager showing "too much skin") and are very subjective but to go to a more extreme example, I think everyone would agree that an individual in a lounge without a top (of any gender) wouldn't be generally acceptable. Even in CNS
Personally (as I've always said), I'm far less worried about what people choose to wear (or not) - as long as it's clean - and for me behaviour is far more o an issue. I mean if someone's out there comfortable enough to wear whatever even if I might think it's a inappropriate - It's on them, not me and if they're OK with that well that's for them to decide and not me.
Now, want to get me triggered? don't get me started about boorish inconsiderate behaviour and selfishness in lounges.....