While traditionally seen as casual or workwear, denim can be elevated to fit more formal occasions with the proper styling. Dark wash jeans in a slim or straight cut can look quite sophisticated and be paired with a blazer, dress shirt, and dress shoes for a business casual or smart casual look. Denim dresses or skirts in refined silhouettes can also be appropriate for formal settings when accessorized correctly. The key is to choose high-quality denim pieces and combine them with classic formal wear elements to achieve a polished look.