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Yes, a dress shirt and tie should be OK. Ship's dining rooms tend to be a bit on the cool side, so you might want to reconsider the jacket from a comfort standpoint. It would also give him the option of wearing the sport jacket over a polo shirt without the tie.My husband likes to wear solid color silk sportshirts (not shiny silk--matte finish) under a sports jacket and no tie for informal nights. He feels comfortable and looks great.
Yes, a dress shirt and tie should be OK. Ship's dining rooms tend to be a bit on the cool side, so you might want to reconsider the jacket from a comfort standpoint. It would also give him the option of wearing the sport jacket over a polo shirt without the tie.
My husband likes to wear solid color silk sportshirts (not shiny silk--matte finish) under a sports jacket and no tie for informal nights. He feels comfortable and looks great.