Abstract: This is a holster for suspending an instrument such as a portable telephone from the waistband belt of a user, or from another fixed object. The holster includes a flexible body member with a cinching strap projecting from one end thereof. One face of the cinching strap is covered with one patch of a mating pair of fabric fasteners. A cinching loop is affixed to the body, about a third of the way along its midlength and in transverse relation to the longitudinal axis thereof. A patch of mating fabric complementary to that on the cinching strap is disposed on the same face of the body as the cinching loop, but at the opposite end of the body from which the cinching strap projects. The opposed face of the body bears an instrument attachment loop. The cinching strap is adapted to be wrapped around a waistband belt or other fixed object, threaded through the cinching loop, and drawn tight, thus cinching the cinching strap constrictively around the waistband belt.