I spent a few hours today in the Milwaukee Public Central Library looking through Apparel Arts & Esquire from 1947 & 1948. I found an article in the April 1948 issue of AA titled "Hatless Harry" Target For the Trade: Prototype of Bare-Headed Men Has Stymied Hat Industry; New Techniques May Sell Him. According to the article... 57% of all men go hatless. 85% of all men under 20 go hatless 63% of all men 20-24 go hatless. 57% of all men 24-34 go hatless. 34% of all men 35-44 go hatless. The article cites the fact that while the American population more than doubled in the years from 1909 to 1947, hat production had dropped from 3 million dozen hats shipped to 1.7 million dozen hats shipped during those same years.