Paul Costelloe, the Irish-American designer who dressed the late Princess Diana and became a stalwart of the London fashion scene, has died, his company confirmed. He was 80. In addition to creating evening wear for Diana, Costelloe established a fashion house that celebrated luxurious fabrics and creative design. He worked in central London and with a family-owned manufacturing site in the Ancona region of central Italy. “We are deeply saddened to announce the passing of Paul Costelloe following a short illness,’’ his label said in a statement on Saturday. “He was surrounded by his wife and seven children and passed peacefully in London.” Born in Dublin in 1945, Costelloe was the son of a tailor who made raincoats at a factory in the city’s Rathmines district. He got his own start in the

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