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The suit jacket 2

Men's Suit Jacket Pockets
The suit have the pockets, which present a variety of options, all at differing levels of formality. The most formal are jetted pockets, where the pocket is sewn into the lining of the jacket and only a narrow horizontal opening appears on the side of the suit jacket. These pockets are most frequently found on formal-wear. The flap pocket, is slightly less formal, though it is perfectly acceptable in all circumstances when a man should wear a suit. Flap pockets include a flap sewn into the top of the pocket, which covers the pocket's opening. These are the most common pockets on men's suit jackets, and in the very best, are fabricated so that the wearer may tuck the flaps inside, mimicking the jetted pocket. There are also diagonally-cut flap pockets known as hacking pockets.
The least formal are patch pockets, which are pockets created by applying a patch to the outside of the jacket. These pockets are the most casual option; they are frequently found on summer suits, as well as on sports jackets.

Some men's suit jackets, tipically bespoke and finer made-to-measure offerings, include a small ticket pocket above one of the side pockets, this pocket is rarely used, it is an indication of the suit's quality.
The jacket has a breast pocket, into that only one item should be ever placed: the handkerchief or pocket square.

Inside pockets
These pockets are generally large enough to carry a wallet or card case, as well as a pen and tickets or other similar papers. Bulky items in the inside pockets, can distort the jacket's appearance. On bespoke suits, the options for pockets are almost unlimited, as a good tailor can create specialty pockets sized to hold a variety of items.
Inside pockets of a jacket

Jacket Vents

Moving on from pockets we find the vents, flap-like slits in the bottom of the jacket which accommodate movement and offer easy access to the trouser pockets. Men's suit jackets have three styles: center, side, or none. 
Ventless suit jackets
, have no vents, and are popular on Continental suits; they provide a sleek look to the back, but they can lead to wrinkling when the wearer sits down. Center-vented jackets are popular on American suits, have a single slit at the back, allowing the jacket to expand at the bottom when sitting.

A side-vented jacket has two vents, one on either side. Side vents are comfortable when the weare sits down, and minimizes wrinkles.

Lapel Button Hole

Most jacket lapels include a button hole on the left lapel, it is generally sewn shut. On most any suit, the buttonhole can be opened. This is to facilitate the boutonnière, a small flower worn on the lapel, though the practice is generally confined to important participants in special occasions, e.g. the groom and groomsmen at a wedding.