Formal wear
Generally permitted other alternatives , though , are the most formal versions of ceremonial dresses ( including court dresses , diplomatic uniforms and academic dresses ) , full dress uniforms , religious clothing , national costumes , and most rarely frock coats ( which preceded morning coat as default formal day wear 1820s-1920s ) . 
<triplet> academic dress <subj> ceremonial dress <obj> subclass of <triplet> full dress uniform <subj> ceremonial dress <obj> subclass of