From Reddit r/100YearsAgo: July 6th, 1922] The Inquiring Photographer asks women in the Flatiron District if they'd go out with a man who didn't wear a coat and vest.

[July 6th, 1922] The Inquiring Photographer asks women in the Flatiron District if they'd go out with a man who didn't wear a coat and vest.

The mere fact that this question made sense in 1922, and doesn't know, speaks volumes as to the change in standards of dress in a century.

And, keep in mind, air conditioning really wasn't a thing in 1922.  So, the Inquiring Photographer was asking this question in July, when it was hot, and the obvious expectation was that any man stepping out with these single women would be wearing a coat and vest, although they seemed to be willing to yield on the question.