“It was a lovely opportunity to move the huge body of research that I’d built up over the series and the films to incrementally push forward again into this new decade and look for the very cutting-edge shifts that were taking place [in fashion] and to mark them in the film ,” said costume designer Anna Robbins, who is bidding farewell to the franchise with the premiere of “ Downton Abbey: The Grand Finale ” on Friday.

The film marks the final chapter in the Julian Fellowes-created drama, which began as a series in 2010. The Emmy Award-winning show quickly became a global phenomenon, chronicling the upstairs-downstairs lives of the Crawley family and their staff in the early 20th century, through World War I and into the roaring ’20s. The series spawned three films throughout the

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