No, but you would be more comfortable in business casual or cocktail dress
No, but it is definitely suggested to wear nice clothes than you would wear to Bourbon St. next door...
No dress code for the bar; but if you plan on dining in the restaurant, Arnaud’s; you should know they don’t allow shorts, and require a collared shirt on gentlemen. Also, pretty sure sandals are frowned upon.
Wear something nice. I would echo Rick's suggestion.
No
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