You could dress up if you wanted to, but like most places in Ann Arbor, you can go pretty casual and they won't turn you away.
Casual. Don't wear a t shirt.
Casual, but the kind of atmosphere where being nicely dressed would be fine too.
Ann Arbor is not a place where people typically dress up. The Earl is fine dining, but casual prevails.
Casual dress (particularly in the wine bar) per typical Ann Arbor culture. The dining room is a bit more formal (or more business casual), often reflecting special event dinners or business hosting. Live jazz is a plus.
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