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Middleton leave City Hall in Belfast, Northern Ireland, on March 8

Its skirt flares out more gradually and has less volume than a ball gown, making it lighter and easier to navigate, sit, and dance in, which is perfect for a long and celebratory wedding day

Black tie optional means the couple wants an elevated evening atmosphere, but they are giving you flexibility: a floor-length gown is a guaranteed win, and a refined cocktail dress, a sleek jumpsuit, or a sharp pantsuit all fit the bill when styled intentionally

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