Apparatus 10 discloses a stackable extension sleeve for a coat hanger 22. The stackable extension sleeve is comprised of a unitary body having a curvilinear top surface 26 sloping down from a central aperture 14 with a back wall 28 extending to the base 30 of the opposing ends and a front triangular-shaped skirt 32 having a slot 16 in communication with the aperture. The bottom edge 30 of the extension sleeve forms a horizontal perimeter whereby the extension sleeve can stand unaided and stacked one upon another.