When cruising with P.O. dressing for dinner was expected and very nice to see, on Celebrity a bit less formal which i like but it seems some people cannot even be bothered to dress smart hence shorts {not very clean either}and sandals in Tuscan grill on a "chic" night the maitre d was nowhere to be seen and the rather loud chap from the USA took umbridge when a fellow diner pointed out to him the dress code.. The trouble with standards is they tend to drop over time ,personally i wouldnt wear jeans to any restaurant. Suit yourselves !