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Casual Friday (also known as dress-down Friday or casual day) is a Western trend, which has spread to other parts of the world, in which some business offices relax their dress code on Fridays. Some businesses that usually require employees to wear suits, dress shirts, neckties, and dress shoes allow more casual attire 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.
((Honolulu Street Style, By Malie Moran, Attila Pohlmann, Andrew Reilly, p.59, Copywrite 2014, University of Chicago Press, ISSN 2047-0568, ISBN 978-1-78320-307-9))