The modern vest is a direct descendant of the 19th-century English postboy's waistcoat. The vest makes a suit a three-piece. Sadly, it has lost a lot of its original popularity by the time of the Great War, and only gained back a part of it after the sixties. However, because the vest is the most challenging for the tailors to make, and because you can rarely buy them off-the-rack, wearing a vest is always a good way to show your good taste and elegance.
In picture: Mr. Poirot sporting the vest in lighter shades.
Sartorial tips >