From Longman Dictionary of Contemporary Englishdress uniformˈdress ˌuniform noun [countable, uncountable] PMDCCa uniform that officers in the army, navy etc wear for formal occasions or ceremonies
Examples from the Corpus
dress uniform• Hans Ebert stood outside, in full dress uniform, his equerry three paces behind him.• In spite of the heat, parties in full dress uniform were sent to scour the countryside.• My father attended in his dress uniform. 