The "arrival gown" is the gown worn by Marie Antoinette when she first arrives at Versailles. The dress is directly inspired by a portrait of a young Marie Antoinette created shortly after she became the dauphine of France. Like the other 'early' gowns worn by Marie Antoinette in the film, the dress is very youthful and innocent.
According to the notes on the concept design for the dress, the "arrival gown" is pink organdy with blue ribbons and flower embellishments. (Read more.)