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Most 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. A jetted pocket with no flap is most formal. This style is most often on seen on formal wear, such as a dinner jacket.