When I made my most recent reservation, they definitely gave some dress restrictions - something like no tank tops - but we always dress to fit whatever it was, so I promptly forgot exactly what she said. The only time I ate there, we changed first, into long pants, but nothing fancy. If I couldn't change, I would wear my "better" park clothes, like maybe a nicer t-shirt (without writing on it) and a nicer pair of shorts. My husband would probably wear a collared shirt that day. It's not particularly fancy though and you can absolutely come straight from the park. You might want to call to check on those restrictions.