My point was, look at the restaurant descriptions on the app. Using Narcoossee's as an example, where is the "sophisticated & upscale aesthetic" described? If one was unfamiliar with the restaurant, how would they discern the difference between Narcossee's and Boathouse, which is also listed as signature/fine dining?
I hear you but that's why I said it's based on a social contract. You're looking at the highest tier type restaurant so social contract would normally dictate attire that matches that. Of course being explicitly clear and actually enforcing their rules to a T would actually help bring consistency which helps on the expectations
but that's probably asking too much in the real world lol. But like I said to me in my personal opinion within a theme park itself you should temper those expectations to adhere to the dress code
Various ways we have to see social contract: number of dollar signs (or price range if dollar signs are not there) or in the wording, or explicit description.
The Boathouse on WDW's website mentions upscale restaurant. Upscale is your clue. They also list it as Fine/Signature Dining. Fine is your clue (I'd include signature as well but that is Disney's term less commonly understood).
Narcoosee's also lists Fine/Signature Dining with the description of "This restaurant is a Disney Signature Dining experience offering fine dining with a distinctly magical flair. Guests are expected to dress accordingly in attire that respects the restaurant's sophisticated and upscale aesthetic. "
Both are 3 dollar signs (though that isn't the highest it can be as V&A is 4 dollar signs). V&A does a better job of spelling it out by saying "Victoria & Albert’s is an exquisite and intimate upscale dining experience and the culinary crown jewel of Walt Disney World Resort. Guests are expected to dress accordingly in
semi-formal/formal attire that respects the restaurant’s elegant and opulent aesthetic." (bolding mine).
So the issue one could come into is that because it's not spelled out exactly what they mean in other restaurants there can be variations on what exactly people are wearing
but the basic point is the social contract by this it means that when you go to an upscale restaurant or a fine dining restaurant expectations follow not just in ambiance of the restaurant but the service, the menu items, even the tipping percentages (though I'm not trying to get into that mess) as well as what one would normally be considered appropriate to wear given said environment.
The cruise company we sail with lists this out as their dress code
Daytime: Casual, resort-style attire, including shorts and jeans, is welcome in all lounges and dining venues. Swimsuits, brief shorts, cover-ups and exercise attire should be reserved for poolside, on deck or in the spa and fitness center.
Evening (after 6pm): Elegant Casual. The following is the nightly dress standard for all dining venues:
Men: Slacks with a collared dress shirt or sweater; Jacket Optional.
Ladies: Slacks / skirt, blouse, pant suit or dress.
Elegant jeans are welcome in all dining venues. (this part has been of high controversy as to what this means but I digress).
In any case I use that as an example because they spell out quite a bit what they mean which still leave a lot of variation but helps the guest understand what is expected of them. Back to WDW and you'll have more the other clues I mentioned since they don't spell out more.
The social contract exists when we're at home the same as it does when you're at WDW, you typically do see people going to higher end restaurants in nicer attire. To use non-Disney examples we used to go to Scarpetta's in Vegas. The dress code reads Business Casual. That can be any number of things that can fall into it but the point is they do expect you to not be in a shorts, t-shirt and flip flops as that is not business casual.
I'm for sure not debating with you either just pointing out that it's not a thing about being new to this forum. It doesn't mean I personally have an issue with what people are wearing and personally do advocate for leeway on places within the parks themselves but just that Disney is counting on people to understand (for better or worse) what these places are expected to be. That's not getting into international variances (though I would say Americans probably dress more casually than some other cultures do).