Most suit jackets have a variety of inner pockets, and two main outer pockets, which are generally either patch pockets, flap pockets, or jetted pockets.
The patch pocket is, with its single extra piece of cloth sewn directly onto the front of the jacket, a sporting option, sometimes seen on summer linen suits, or other informal styles. The flap pocket is standard for side pockets, and has an extra lined flap of matching fabric covering the top of the pocket. A jetted pocket is most formal, with a small strip of fabric taping the top and bottom of the slit for the pocket. This style is most often on seen on formal wear, such as a dinner jacket.
In addition to the standard two outer pockets, some suits have a third, the ticket pocket, usually located just above the right pocket and roughly half as wide. While this was originally exclusively a feature of country suits, used for conveniently storing a train ticket, it is now seen on some town suits. Another country feature also worn some times in cities is a pair of hacking pockets, which are similar to normal ones, but slanted. This was originally designed to make the pockets easier to open on horse back while hacking.
Suit jackets in all styles typically have three or four buttons on each cuff, which are often purely decorative. Five buttons are unusual, but are a modern fashion innovation. The number of buttons is primarily a function of the formality of the suit; a very casual summer sports jacket might have traditionally have had only one button, while tweed suits typically have three and city suits four. In the 1970s, two buttons were seen on some city suits. Today, four buttons are common on most business suits and even casual suits.
Although the sleeve buttons usually cannot be undone, the stitching is such that it appears they could. Functional cuff buttons may be found on high end or bespoke suits, which is called a surgeon's cuff. Some wearers leave these buttons undone to reveal that they can afford a bespoke suit, although it is proper to leave these buttons done up. Modern bespoke styles and high end off the rack suits have the last two buttons stitched off center, so that the sleeve hangs more cleanly should the buttons ever be undone.
A cuffed sleeve has an extra length of fabric folded back over the arm, or just some piping or stitching above the buttons to allude to the edge of a cuff. This was popular in the Edwardian era, as a feature of formal wear such as frock coats carried over to informal wear, but is now rare.
A vent is a slit in the bottom rear of the jacket. Originally, vents were a sporting option, designed to make riding easier, so are traditional on hacking jackets, formal coats such as a morning coat, and, for reasons of pragmatism, overcoats. Today there are three styles of venting, which include the single vented style, vent less style, and the double vented style. Vents are convenient, particularly when using a pocket or sitting down, to improve the hang of the hang of the jacket, so are now used on most jackets. Vent less jackets are associated with Italian tailoring, while the double vented style is typically British.
Suit jackets with belts on them became popular after World War I, especially on the exaggerated jazz suits, which were popular in 1920 and 1921. After 1921, a more subdued style prevailed in which the belt was placed solely on the back of the coat, a half belted back. This continued on many suit coats throughout the 1920s and early 1930s, usually on very fashionably made suits for the young. This style made a brief come back in the 1970s when some suit coats again featured belts on the back.