Abstract: A garment expander, of the type equipped with a bent sheet metal hook on one flap of the fly opening for hooking through a bent sheet metal eye on the other flap of the flap opening, has at one end a resilient loop which strongly but detachably captures the eye and has at the other end a planar area with a rigid bridge protruding from the planar area in a plane parallel with it for aligning and engaging the trouser hook; when tension is applied the loop may permit the eye to turn slightly within the loop for better trouser appearance; the invention is adapted for high-volume low-cost production with minimum operations.