Abstract: The present invention discloses an iron-on pocket for a pocketless shirt or similar article of clothing adapted to receive a pocket wherein a piece of pocket material substantially similar or equivalent to the shirt material and cut in the form of a pocket having a top edge, a bottom edge, a pair of sides a front surface, and a rear surface adapted to be operatively disposed against the surface of the shirt or article of clothing designated to receive the pocket. An attachment device including a first layer adapted to be fixedly secured to the interior surface or folded back edge surface of the pocket material proximate the peripheral edge portions of the bottom and sides of the pocket material and a second thermally-activated or heat responsive adhesive layer is fixedly secured to the first layer and has its rear surface adapted to be disposed against the shirt or clothing material in which the pocket is to be mounted.