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Re:Who Killed Men's Hats? Think Of A Three Letter Word Begin... by alttag on Saturday May 05, 2012 @09:13PM (#3933795)
It's not just the roof distance .. when driving, it's significantly less comfortable to wear a hat with a (rear or full) brim against a headrest.
Re:Who Killed Men's Hats? Think Of A Three Letter Word Begin... by dredmorbius on Saturday May 05, 2012 @10:10PM (#3933915)
Headrests really didn't start becoming commonplace until the late 1960s / early 1970s. They were made mandatory in the US only on January 1, 1969.

http://www.webcitation.org/62vMMUPPX

This post-dates the hatless trend by about a decade, though it certainly wouldn't have helped the haberdasher's trade.

Re:Who Killed Men's Hats? Think Of A Three Letter Word Begin... by alttag on Saturday May 05, 2012 @11:28PM (#3934060)
Good points. Caused me to do some additional research (beyond my personal experience with hats).

Patents for headrests were granted in 1921, 1930 and 1950. [1] According to some sources, they began to appear in cars in the 50s and 60s [2], which coincides with (and slightly pre-dates) the JFK theory.

1: http://en.wikipedia.org/wiki/Head_restraint 2: http://www.ehow.com/facts_7597635_use-headrest.html