Any type of attire is acceptable, however I usually dress business casual depending on the event or occasion.
If you wear jeans, I would wear a sports jacket or go business casual.
It is a popular spot for business crowd at lunch and dinner (so a lot of business attire) but there are always patrons who are dressed a little more casual.
I think as long as you're not in shorts and sandals, you won't look out of place. They would probably still seat you if you did.
When I went a few weeks ago, after work I was dressed business casual. However I do remember seeing people there dressed casually in jeans and such.
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