DCCa man’s suit that is worn at formal ceremonies during the day, especially weddings 〔男士在婚礼等正式典礼上穿的〕晨礼服，常礼服
Examples from the Corpus
morning suit• On the morning she saw him standing in the body of the church, dark as a gypsy in his morning suit.• He was dressed in a Victorian morning suit, high starched collar, watered-silk cravat.