Read this and answer the question. If the question is unanswerable, say "unanswerable".

On Saturday September 6, 1997 the formal, though not "state" Funeral of Diana, Princess of Wales, was held. It was a royal ceremonial funeral including royal pageantry and Anglican funeral liturgy. A Second Public service was held on Sunday at the demand of the people. The burial occurred privately later the same day. Diana's former husband, sons, mother, siblings, a close friend, and a clergyman were present. Diana's body was clothed in a black long-sleeved dress designed by Catherine Walker, which she had chosen some weeks before. A set of rosary beads was placed in her hands, a gift she had received from Mother Teresa. Her grave is on the grounds of her family estate, Althorp, on a private island.[citation needed]

Who never designed Diana's dress?
unanswerable