I honestly think that you should not be wearing casual clothing in a casino. It is a place of amazing excitement and happiness, and that is why I feel that you should wear clothes that will complement the mood. The atmosphere in a casino is very active and exhilarating. I feel that you should wear clothes that complement the location and occasion. If you are a guy, I feel that you should be wearing tuxedos or a blazer with a decent pair of pants. If you are a woman, I feel that the best choice of action would be a cocktail dress. You can either wear pants and a very nice top.