The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page.(December 2010)
The tropical roots of Casual Friday go back to at least 1947 in Hawaii, when the city of Honolulu allowed workers to wear the Aloha shirt part of the year. The term Aloha Friday dates from the 1960s, when the shirts were worn on Fridays instead of normal business attire. In the continental US in the 1950's, Hewlett-Packard introduced "casual Fridays," because Fridays were when everyone in the company pitched in at the warehouse, packaging goods for shipment. Casual Friday, along with dressing casually during the week, became very prevalent during the Dot-com bubble of the late 1990s and early 2000s rooted in a relaxed California-based business culture.