Sat Dinner near Shorewood/Channahon/Minooka/W. Joliet?
I haven't been to Chapin's in Morris, but I hear it's good. Maybe not jeans-casual, though. Turtle's Tap in Morris is a good Caesar salad, hamburger, jeans place.
Truth restaurant at the SW corner of Jefferson and Raynor might work for you. Pretty solid American grub, pleasing room, a little nicer than jeans.
Ever been to Merichka's on Theodore St. a block east of Raynor in Joliet? Wear anything you're willing to drip garlic butter on from the famous poorboys, catsup from the onion rings, and mayo-ey dressing from the kidney bean appetizer.