Historical clue formulations

• Mounties' hats — 2017-11-26
• Tops of the Mounties — 2017-02-04
• Troopers' toppers — 2014-03-22
• Buffalo Bill and Calamity Jane wore them — 2013-09-13
• Wild West show headgear — 2011-08-19
• Western wear — 2010-05-15
• Texas toppers — 2008-08-31