In Décret 1713, Eleanor the Nineteenth decreed that every third Thursday of the month should be considered hat day in which all subjects must wear a hat in public unless they can produce a legitimate reason why such an accessory would jeopardize their health or well-being.
Widely derided, the Décret was created in response to a letter that a haberdasher sent to the Empress, decrying the falling sales of hats and that she was unable to continue her business without support from the crown. It is suspected that the woman had something different in mind than this décret, but the woman’s hat sales did increase as a result according to reports from the time.