Garment with tension closure pocket

A garment or article of clothing made of a resilient/elastomeric material includes at least a waist portion, a first leg portion, and a second leg portion. The waist portion further includes a pocket on the rear of the garment, where the pocket is defined by a backing panel, a first flap, and a second flap. The first flap is at least partially disposed over the second flap to secure contents between the backing panel and the second panel, and thus, within the pocket. When the waist portion is stretched, the tensile forces imparted onto the waist portion by the resilient/elastomeric material causes the first flap to at least partially overlie the second flap. The pocket is sized and shaped to receive smartphones and other small personal items, such as keys, money, credit cards, identifications, etc.