No code perse but I'd advise against going too casual as you will feel out of place. Business casual sounds fine but even blue jeans will appear awkward. Fine food, linen, formal tableware, well dressed staff and quiet/cozy environment should motivate you to dress for the occasion.
No not really but you can dress up or not
Some people dress up some people come in blue jeans
No.
A truly good place.
Nice casual will work fine.
Not that I am aware of. Most folks are in business casual
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