Aspects herein are directed to a pocket structure that facilitates the secure storage of items stowed within the pocket structure. The pocket structure includes inner and outer pocket layers and a funnel-shaped structure positioned in the space between the inner and outer pocket layers. The funnel-shaped structure comprises an inlet opening that forms an opening to the pocket structure and an outlet opening that is in communication with the space between the inner and outer pocket layers. The outlet opening has a smaller circumference compared to the inlet opening.