Formal wear
Formal wear being the most formal dress code , it is followed by semi-formal wear , equivalently based around daytime black lounge suit , and evening black tie ( "dinner suit/tuxedo" ) , and evening gown for women . 
<triplet> black tie <subj> evening gown <obj> has parts of the class <triplet> evening gown <subj> Formal wear <obj> subclass of