We had golf attire for the season. I also saw business casual.
I've seen gym clothes but I imagine they felt under dressed. I've seen a lot of business casual/church crowd. They do have a small sign above the entrance that says "No hats in dining area, please." which I didn't notice until my 3rd visit (WHOOPS) but no one said anything to me about it.
Golf shirt and shorts are fine for men.
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