brown a line dress Simple Evening Party Dresses Long Prom Dresses With Slit A%20Line%20Maxi%20Dress%20Brown%0D%0ADESIGN%3A%0D%0A%0D%0AColor%3A%20Brown%0D%0AAsymmetric%20neckline%0D%0ACap%20sleeves%0D%0AA Standard / XS Brown Polka

This look pairs a denim top with denim bottoms like a jacket or shirt

Its vague and can result in guests wearing a hodgepodge of looks that are all over the map when it comes to levels of formality, Alexandra Macon, Vogue contributing editor and co-founder of Over the Moon says

A call for formal clothes (similar to black-tie optional attire) offers a bit more flexibility than black tie, so ankle-length dresses and dressy separates are acceptable, as well as fitted, darker-hued suits paired with a crisp white button-down and tie

It is recommended to start shopping several weeks or months before your event

It is about how something makes you feel