Dundee Tavern is the epitome of A-OK. Decent crinkle fries, pretty good and reasonably priced drinks (cheap wine), and pretty nice folks. It is very homey and laid back, and you are perfectly fine in shorts and a t-shirt. They seem to have a decent happy hour towards the end of the week which isn't as common (none on Mon/Tues), but that might just make this a solid Thurs/Fri pre-game place. Though I feel certain I would feel a bit out of place in a dress.
Can't wait to check out 3.50 Bloody Mary Sunday. Sounds like theirs has a kick!