The Diamond is similar to other cruise ships. On Formal nights, tux or dark suit and a gown for the ladies, on Informal nights, sport coat and tie and perhaps a pants suit, and on casual nights, sport shirt and slacks and similar for the ladies. Forgive me, I am a man and I just don't know the appropriate terms. The Diamond is a nice ship. Not as nice as it was with the female wait staff, but a very comfortable ship with good entertainment and lecture staff. It used ti be our favorite ship of 90+ cruises.
Just got back from a Celebrity cruise to the eastern carribean, unless you really want to, hardly anyone really wore a long dress and tuxes like they tell you too. A nice dress, "cocktail" perhaps even a dressier sun dress for women seemed exceptable. I felt completely overdressed in a long dress and my husband couldn't wait to get out of his suit, especially when you are walking by people still sitting in their bathing suits staring at you. But if you like that kind of attention you can get all dolled up, hair done at the salon and tuxes for the men and you will fit in also. We had no choice, we went with ALL of my in laws!!!
I will be on the Diamond next week, 12-19 July in the Med. I am travelling with my 14 year old son.
I am planning to wear dressy sundresses (long) and skirts with sweaters or knit tops for dinner every night. Just try to get a 14 year-old in a tux. Laughable. He bought a totally polyester "Chinese Tux" in Chinatown in NYC last month - He's going with that for "formal night". The other nights I will be lucky to get him in a sport coat/tie. I figure there's always room service for him as an option!
Absolutely EVERYONE I've talked to about dressing on a cruise says the cruise line always tries really hard to suggest that people dress up. Hardly anyone does - can you imagine packing and carrying a different outfit for dinner every night? It's just not practical - or necessary. I don't even own a "cocktail dress" or a "pantsuit" - nor do I have any desire to wear either. I will be presentable and comfortable - and other than that... well, everyone will just have to deal with it.