Princess Margaret wore a cream Dior dress for her 21st birthday commemorations at Sandringham House in 1951. The off-the-shoulder silk gown was created and customised by designer Christian Dior, whom Margaret became closely associated with. The princess was captured in the piece, dubbed one of her favourite dresses, by Cecil Beaton, with the portrait becoming one of the most memorable royal photographs of the twentieth century. The dress has been cited as a part of fashion history, and has been a part of the permanent collection at the Museum of London since 1968.