A grand, old style dress designed to make it clear it's to be worn for the holiday season.
The standard form is a dress with a tasteful bodice (though it can include an Impossibly Low Neckline or Absolute Cleavage), a full length bell-shaped skirt, and a generous amount of trimmings such as fur (that's usually white), jewelry, ribbons, etc. Best designed to wear during a formal dance, lounging [...] [tvtropes.org]