Considering how choice of hat signaled class I think you would find that most men did not wear top hats when these pictures were taken. If you look at the pictu

Considering how choice of hat signaled class I think you would find that most men did not wear top hats when these pictures were taken. If you look at the pictures in the article, few people are wearing hats and no one is wearing a top hat. I think top hats were also going out of fashion before and during the war.