The atmosphere recommends a dress attire. Personally, I would feel out of place with jeans and a shirt.
I wouldn't go less than business casual.
I have not seen a stated policy, but the atmosphere definitely calls for a certain level of dress.
Go here all the time, nice jeans and dress shirt is perfectly fine.
My date wore nice jeans and a dress shirt. I wire a casual dress and boots. We didn't feel out of place.
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