I knew people would disagree---that is what makes it an "unpopular opinion"
I happen to think that if someone CHOOSES to dine somewhere with a suggested dress code at a certain level of formality they ought to adhere to it, or else choose to dine elsewhere.
Obviously plenty of people feel differently based on all the basketball shorts and sweats one sees in the MDR on cruise ships--I will just quietly think to myself that such people lack basic respect for guidelines, staff and fellow passengers when they show up like that--while enjoying my dinner dressed as requested in the venue I chose to dine in.
(and, funny enough there are many levels of formality between "dressed to the nines" senior prom, etc clothing and shorts/sports attire. I think it is kind of good to know how to read a situation and hit about the right level---things like cruises were one way MY kids learned that---what they did NOT learn was that the guidelines did not apply to them becuase they were "kids""on vacation""paid for this" or whatever other excuse.---I know many others think it doesn't matter. So be it. That is what make my opinion unpopular. Lucky for me, with my kids it was my rules

)
I agree.
I think you need to follow the suggested dress guidelines of whatever venue &, even if there are no "suggested guidelines," I think you need to dress to fit the occasion. Growing up, my mom impressed upon me the importance of looking put together & the need to wear attire that fits the event or location.
As an aside, I love America, but, as a whole, we've really gotten kinda sloppy & slouchy looking.
DH & I were just talking about this the other day after a funeral we attended. I'm not saying everyone should attend a funeral in formal business attire, but there should be a level of respect that's displayed by what you wear.
Anyway...
My unpopular fashion opinions:
Just because you *can* wear something doesn't mean you should.
Booties are fine w/ slacks or longer dresses/skirts, but I'm another one that doesn't get the booties look w/ shorts & shorter dresses/skirts. Possibly, it's because I have short legs, &, if I wore booties w/ a short dress/skirt, it'd make my legs look even shorter.
I'm also not a fan of bra straps showing.
I don't like the extreme eyebrow and/or eye liner look.
I can't stand Birkenstocks, & the original
Crocs shoe isn't really a good look on anyone.
And this is my own personal quirk - I don't like khaki pants - especially pleat-front, especially in the evening, & especially on men. Khaki pants are fine for daytime wear or less formal occasions, but I just have this hang-up about khaki pants on men in the evening or at formal events like weddings. Khaki is just such bland color & not as sharp as navy or gray or black. I think it's because so many different places of employment require khaki pants... I don't know.
Also... I hate that women don't wear hose any more. In the fall & summer, it's fine because I have a tan. But I'm really self-conscious of how my bare legs look in the winter & early spring.