A tuxedo or a D.J. and maybe a couple of cocktail or evening dresses will be a good thing to have as you will certainly have two formal nights and you won't feel overdressed at all. People in all the restaurants dress well on Cunard Transatlantic Cruises. The shame is you loose an hour most nights going that way, sailing out to the USA you gain 5 extra hours of self-indulgence.. All the beat....Ida Dow.
A trans-Atlantic cruise is more formal than a cruise in, say, the Caribbean. During the day, people definitely tended towards country club casual. At night, even when it wasn't a formal-designated evening, people dressed anyway. A six-night crossing will typically feature two casual nights, three formal nights and one informal nights. The dress for formal evening is a tuxedo or alternatively dark suit for gentlemen and evening gown or other appropriate attire for the ladies. While dress codes are enforced in Britannia and Grill restaurants, passengers can relax a bit when dining in the Kings Court.