Most single-breasted suit jackets have two or three buttons, and one or four buttons are unusual (except that tuxedo dinner jackets often have only one button). It is rare to find a suit jacket with more than four buttons, although zoot suits can have as many as six or more due to their longer length. There is also variation in the placement and style of buttons,^[1] since the button placement is critical to the overall impression of height conveyed by the jacket. The centre or top button will typically line up quite closely with the natural waistline.^[2] Double-breasted jackets have only half their outer buttons functional, as the second row is for display only, forcing them to come in pairs. Some rare jackets can have as few as two buttons, and during various periods, for instance the 1960s and 70s, as many as eight were seen. Six buttons are typical, with two to button; the last pair floats above the overlap. The three buttons down each side may in this case be in a straight line (the ‘keystone’ layout) or more commonly, the top pair is half as far apart again as each pair in the bottom square. A four-button double-breasted jacket usually buttons in a square.^[3] The layout of the buttons and the shape of the lapel are co-ordinated in order to direct the eyes of an observer. For example, if the buttons are too low, or the lapel roll too pronounced, the eyes are drawn down from the face, and the waist appears large