Dress shorts and cargo shorts? No problem. Polo shirts? Likewise. Tee shirts can be questionable depending on the styles and such but I'm sure neither of you would be wearing anything objectionable that would give you cause for concern.

One thing that amazes me, and I've never seen it but have heard and read about it many times, is that men might not be permitted into some casinos wearing sandals of the teva type as opposed to leather dress sandals.

Being a visitor from back in the day when suit jackets and tuxes and dresses and heels were required for entrance, I do get they don't want the casinos frequented by people dressed in beach wear but no sandals? I don't get that one at all