JackieL based on our experience the other nights are classed as "Informal" or "casual". There were a number of ladies who still wore less dressy cocktain gowns whilst others wore simple day gowns. Men tended to wear trousers with a long sleeved open neck shirt. There were some gentleman who prefered to wear collar and tie and lightweight sports jacket.
Our motto is - we are on a holiday - it is a special occasion and it is down to us ro make it just that!