What to Wear at Jazz Fest

Next week I'm headed to New Orleans for Jazz Fest, and while it's not my first time in the city it is my first time at the music festival. I'm taking my cues on what to wear from the attendees at the recent Coachella and am aiming for casual, hippie chick cool. While my first inclination would be to wear a cute sundress, something about eating crawfish and fried oyster po' boys seems down an dirty and cries out for shorts.