You are probably OK if you eat in the buffet, not the main dining room. Here is what their website says: 'Dinner Dress
There are three smart casual and two formal evenings on every seven-day cruise. Please note, informal wear or formal wear is recommended at the Pinnacle Grill at all times.
Informal nights - sport jackets for men and dress slacks, casual dresses or skirts for women
Formal nights - jacket and tie required or tuxedo suggested for men, cocktail dress or gown for women
Please note: Your daily program will contain a notice of the dress for each evening. Jeans, t-shirts, hats, shorts, tank tops, swimwear and workout attire are not permitted in the dining room or Pinnacle Grill at any time, but are allowed in the Lido restaurant. Not sure what to wear? While on ship, contact the cruise director or other cruise staff at the Front Desk and they will gladly offer advice.'
How many formal nights when you are doing a twelve night cruise.
How do you pay the gratuites, is there a set amount or is it up to the individual.