Wear white linen pants, even!
One of the most popular art events in town, Whitney White Linen Night, takes place each year at the Julia St. Arts District (this year, it's on August 6th, from 5:30-9:30pm). And yes, pretty much everyone gets to wear their finest linen clothing, stroll through the galleries, and listen to music, and, if they want to pay for it, drink wine and act like a real sophisticate.
... and then dirty linen pants
Of course, any hint of snooty cultural sophistication will not go unanswered in New Orleans. Hence, as a response to White Linen Night, we now have "Dirty Linen Night," which still celebrates art and music for free, only down and dirty in the French Quarter. On August 13th, you’re encouraged to don the soiled white linen clothing you had too much fun wearing at the previous event. Not that anyone really does that, but it’s a fun idea.