A top sizer for use with a garment hanger including a hollow body having an open bottom and a top wall that has a first opening formed therein that provides communication to the hollow interior. The top sizer includes a locking feature associated therewith that is configured to permit the top sizer to be releasably engaged and secured to the hook member. The locking feature is formed above the first opening, wherein the locking feature has a slot that defines a pair of opposing resilient locking tabs. The slot is defined by an open end portion (entrance) and an inner portion that has a width greater than the open end portion, with free ends of the locking tabs and the open end of the slot being in communication with the first opening to permit a hook member of the garment hanger that is in the first opening to be received into the open end of the slot and then into the inner portion once a biasing force of the locking tabs is overcome resulting in the hook member being captured in the inner portion and the top sizer being locked relative to the garment hanger.