I'll be sailing on the Regal Princess in December & was wondering about formal night.  On other cruise lines when they have formal night in the main dining room, it is not mandatory & you can still be seated without wearing a jacket.  I asked a Princess representative about their policy & they didn't know the answer. This is our first Princess cruise so don't know what to expect.  Neither myself or my wife plan on packing formal wear.  Does anyone have any experience w