A suit jacket that was designed using the bespoke suit design tool, has either one or two rows of main front buttons. A single-breasted jacket has anywhere from one to four, though two and three button jackets are most common.
The three-button jacket is the most traditional configuration, taking its cue from English riding jackets; properly worn, it gives the illusion of height. It’s common practice to button the middle or second buttons when standing, though the top two buttons may be fastened to produce a slightly more formal appearance (A great way to remember this is Sometimes – Always – Never).
Two-button suits are a slightly later innovation, and because they show more of the shirt and tie, can have a slimming effect. Only the top button of a two-button jacket is fastened. With the exception of the one button jacket, the bottom button is never fastened.
Double-breasted jackets most commonly have either four or six buttons (also referred to as 4 over 2 or 6 over 2) on each side – where there are six buttons, only the lower four are for buttoning, though due to the design of the suit, only two will actually be buttoned at any given time. There is also an extra hidden button called a “jigger” on the reverse of the outside flap of a double-breasted suit, onto which the inside or “hidden” flap attaches.
Contrary to the habits of certain celebrities, a double-breasted jacket should never be left unbuttoned when standing; it is always securely buttoned upon standing and remains buttoned until one is again seated.
Additionally, while the bottom button of a single-breasted jacket is always left undone, it is acceptable for both of the operable buttons on a double-breasted jacket are fastened. However, this practice is looked down upon more stylish men. As with the gorge of the lapel, the height of the waist buttons can been altered slightly to accentuate or diminish height, but this must be done carefully.See more….