An expandable garment hanger with which the invention is concerned has a body (1), a hook (2) on the body to suspend the hanger and a pair of movable arms (3,4), slidably mounted on the body. The arms are arranged to move in opposite directions. A locking device (8,9) is located on the body (1) of the hanger so as to lock the movable arms relative to the body. The locking device is movable along a path parallel to the path along which the arms are movable. A biasing device, preferably a spring (27), is provided for biasing the locking device (9,9) against movement in one direction so that when the arm of the hanger is set and locked in position the arms of the hanger are movable against the biasing force of the spring (27). The hanger conveniently supports garments of varying waist widths and maintains the hanger at the desired widths once the garment is mounted on the hanger but also allows the garment to be removed from the hanger by a small inward force applied to the end of the arm.