I was last there in July for an early dinner and everyone was dressed in casual attire that ranged from shorts, sun dress's to business casual... Can't wait to visit again!...The food is exceptional!.
Casual to business casual
I would say that casual is fine, however most guests wear semi-formal attire. I wore jeans and sneakers with a collared shirt and felt a little underdressed, but there were others dressed the same. Several diners wore jackets and dresses and there were a few with ties as well. It didn't seem they were turning anyone at for being underdressed.
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