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Casual Friday (also known as dress-down Friday or casual day) is a Western dress code trend since late 20th century, in which some business offices relax their dress code on Fridays. It has since spread to other parts of the world. Some businesses that usually require employees to wear lounge suits, dress shirts, neckties, and dress shoes, may allow more casual wear on Fridays.
Casual Friday had its origin from Hawaii's custom of Aloha Friday which slowly spread east to California, continuing around the globe until the 1990s when it became known as Casual Friday. Today in Hawaii, Aloha Wear is worn as business attire for any day of the week, and Aloha Friday is generally used to refer to the last day of the work week.