Abstract: A locking device fits over the hook of an ordinary garment hanger to secure it to the hanger bar in such a way that the hanger can be moved along the bar but cannot be removed therefrom. The locking device also carries a chain or the like which can be threaded through, e.g., a sleeve of the garment and hooked to the locking device. When unlocked, the device allows removal of the lock, hanger, chain and garment as a unit, or of the lock and/or chain alone; when locked the device and chain secure both the hanger and the garment to the bar. The entire device can easily be placed and removed from the hanger and garment in an easy motion as needed. For additional security, the key may be made removable only in the locked position.