Denise, no offense taken! Just wanted to emphasize my point. And I believe you about the people wearing Converse to the opera. I bet they are young people, though.
Molly, I stand corrected. I have never personally seen a wedding guest in a t-shirt, but it sounds like such a thing does exist.
I did, however, attend a funeral last year at which there were a number of guests -- including family members! -- who were, I felt, dressed far too informally. It was a great-auntie of mine, and her 60-something-year-old son was there in chinos and a polo shirt. I was astonished. Granted, he's a labourer, and normally he's in overalls, but still. A funeral is the one place where you really want to broadcast respect, and I couldn't figure out why on Earth he was so underdressed, because he actually had a very good relationship with his mother. I can only conclude that he was not intending any disrespect, but was simply a little clueless. And given the circumstances, probably not overly concerned with something that he probably saw as social silliness. He's not the type of man to care one bit about clothes, so why should he start now, when he's freshly bereaved?
I guess what I'm saying is that we have to give people a break. Maybe the guest at that wedding was also clueless. Or, as you say, depressed.
RNB, I couldn't agree with you more when you say that an outfit screams different things to different people. Also, it depends who's wearing it. A teenager wearing Converse to the opera looks different than a middle-aged woman doing the same thing. And a rock star can wear Converse wherever she likes.
I also agree about the outfit having to be in context. In the field of visual effects, you DO NOT wear a suit to an interview. You'd look hopelessly out of touch. My husband is often conducts interviews, and if a guy (it's usually a guy) shows up wearing a suit, he knows right away that the guy knows nothing about the industry.