hat hair

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hat hair (uncountable)

1. (idiomatic) An accidental messy hairdo resulting from the wearing of a hat.
   • 2003 February 17, Elissa Gootman, “A Chill Most Bitter: Learning to Accept Hat Hair”, in The New York Times‎^[1], archived from the original on 27 May 2015:

     But winter can also be judged by the prominence of another scourge, one that is especially irksome in a city that places a premium on being well-groomed and immaculately coiffed: hat hair.

   • 2012 December 7, Zara, “The Measure: what's hot and what's not”, in The Guardian, retrieved 13 March 2018:

     Beanie hair: Officially the worst hat hair to have: flat, fuzzy and drab.