From Longman Dictionary of Contemporary Englishfull dressˌfull ˈdress noun [uncountable] DCCspecial clothes worn for official occasions officers in full dress uniform
Examples from the Corpus
full dress• The first full dress rehearsal occurred on July 10 and 637 aircraft took part, a few less than on the actual event.• Against the walls sat row behind row of chiefs, in all the glory of full dress.• Perhaps this was his idea of full dress for a ceremonial occasion. 