Casual Friday or Dress-down Friday is a semi-reprieve from the constrictions of a dress code that some offices celebrate. Whereas, during the rest of the week, business shirts, suitss, ties and dress shoes are the norm, on Casual Friday workers are allowed to wear casual dress. Some companies allow jeans, T-shirts, and sneakers but others require smart casual dress.

Some compamies and schools operate an occasional "dress down" day, where employees pay a small fee to be allowed to wear casual clothes (or even fancy dress); the money being donated to charity.