Yeah, so you've noticed the same phenomenon. I think these people think that they are wearing hats, but I don't really understand the social customs and assumptions involved
Back in the summer of 1981, the theatre group I worked with decided to enter the Westerner Parade that year. The idea was to do a mock Royal Wedding, and they went around at the production party of Jesus Christ Superstar (the musical we did that spring) and asked the techies if we wanted to be part of it - as actors, not tech people. So I got to wear a long, fancy white lace dress, long gloves, hat, and learn to wave regally... and walk three miles on pavement, in medium-heeled sandals, staying in character the whole time.
Damn, my feet hurt at the end of that. It was fun, though.
Our "Lady Di" was brunette, and I was about 10 years too old for the part I was playing (one of the flower girls). But our "Queen Elizabeth" was really from Scotland, and I forget who supplied the corgi on the leash... Somebody in town actually owns a double-decker bus and it followed us as we walked along the parade route. From time to time "Lord Snowden" would gather us all in a group to take an "official" photograph.
Later on, someone in the theatre gathered the photos, newspaper writeup, and notes for this whole thing, made a copy, and sent it off to Buckingham Palace to show the real Queen how we had commemorated Charles & Diana's wedding. It's weird to think that somewhere in the palace archives, there's a picture of me, at age 18, in a "Royal Wedding" costume.
But our hats weren't weird. We were all very ladylike and
normal-looking.