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Advertisement - Continue Reading Below 1971 Getty Images A blue polka-dot maxi dress hailing from Christian Dior's 1970 spring/summer haute couture collection

Straight leg, bootcut or flared styles are the most stylish option and I would stay away from overly baggy or skin-tight shapes, explains fashion editor and stylist Julie Player

Scroll down for video Real colour revealed: This photo shows that the dress - and the matching jacket - are clearly black and blue What a wedding: Grace posed on her wedding day with another guest from the wedding Now her family have claimed the experience of picture of the dress going viral has been, 'very weird.' Cecilia's daughter Grace married her husband Keir Johnston in Colonsay, Scotland, earlier this month with her mother choosing to wear the 50 dress from Roman Originals

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