Wear Something Gaudy Day

Celebrated every year on October 17

Wear Something Gaudy Day was created in 1970-something  by the tv show character Larry Dallas from the American comedy show “Three’s Company“.
At least that is what all the sources say. But even after spending half an hour in a search engine and browsing several episode guides the source episode is quite unclear.
Any sage wise person who does know the episode, please tell us in the comments!
We’d love to make the info more complete.

 
gaudy
 adjective
gau·dy | \ˈgȯ-dē,  ˈgä-\

  1. very showy or ornamented, now especially when excessive, or in a tasteless or vulgar manner
  2. gay; merry; festive