MILAN/LOS ROQUES, Venezuela (Reuters) – The family of missing Italian fashion boss Vittorio Missoni said on Monday they still believed he was alive, three days after his plane disappeared off the coast of Venezuela. The small twin-engine aircraft carrying Missoni, 58, his wife Maurizia Castiglioni, another couple and two Venezuelan crew members went missing on Friday after taking off from the island resort of Los Roques. "We are full of hope and confidence for the work that the authorities have done so far. …