Today's semi-formal black tie (originally "dinner clothes") was initially described as informal wear, while the "lounge suit," now standard business wear, was originally considered (as its name suggests) casual wear. "Half dress", when used, was variously applied at different times, but was used to cover modern morning dress (the term "morning dress" is fairly undescriptive and has not always meant modern morning dress). "Undress" (not to be confused with naked) in turn was similarly loose in meaning, corresponding to anything from a dressing gown to a lounge suit or its evening equivalent of dinner clothes (now one of the more formal dress codes seen in many Western regions).