A top sizing system for a garment hanger. The system includes a sizer seat secured to an upper portion of the hook of the hanger. The seat includes a ledge and a tab extending substantially perpendicular therefrom. The tab includes at least one guide slot. The system further includes a sizer having an internal cavity configured to receive the tab therein. The sizer has at least one guide repositioned to engage the guide slot whereupon the sizer can be moved from a first unengaged position to a second engaged position.