1
general::
Phrase(s): coat and tie
[for men] a jacket or sports coat and necktie. (A respectable but less than formal standard of dress.) • My brother was not wearing a coat and tie, and they would not admit him into the restaurant. • I always carry a coat and tie in my car just in case I have to dress up a little for something.
McGrawhill's American Idioms And Phrasal Verbs