Where (wear?) are all the hats

What happened to the hats. It seems like everyone wore hats in the early part of the last century. When did that all stop? How elegant was your mother and grandmother. I am jealous how about you?

The following site has an excellent summary of the history of hat wearing over the last 100 years or so.
http://www.hatshatshats.com/history.htm?ArdSI=1397a824c9bce26c8c1509513554d7b9