Not permitted in the dining room during the Cruise Casual dinner for ladies and gentlemen: shorts, gym shorts, basketball shorts, beach flip-flops, bathing suit attire, cut-off jeans, sleeveless shirts for men and baseball hats.
The past 3 cruises, I have seen flip-flops and blue jean shorts being worn in the MDR and no one every said anything. That has always been my *****, they don't enforce the rules.
I use to wear Tux, but haven't the past several cruises. Hardy seen them anymore.