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Casual Friday (also known as dress-down Friday or casual day) is a Western dress code trend in which businesses relax their dress code on Fridays. Businesses that usually require employees to wear suits, dress shirts, neckties, and dress shoes, may allow more casual or business casual wear on such days.
The trend originated from Hawaii's midcentury custom of Aloha Friday which slowly spread to California, continuing around the globe until the 1990s when it became known as Casual Friday. Today in Hawaii, "Aloha Wear" is suitable business attire any day of the week, and the term "Aloha Friday" is generally used simply to refer to the last day of the workweek.