A chair-back mountable garment hanger has a main supporting body; at least one fastening element configured to attach the supporting body to a seat back, and a hanger element supported by the supporting body. In one configuration, the main supporting body has a pair laterally extending wings, and a back adapted to lie against a back surface of a seat back. Mounting hooks are coupled to respective laterally extending wings, and are configured to be hooked over the seat back to thereby hang the main supporting body from the seat back. A hanger element, formed of a single piece of wire, defines a pair of garment shoulder support portions and a pair of downwardly extending support members which slidably engage with, and extend from a top edge of, the main support body, whereby the hanger element is vertically adjustable relative to the main support body.