A diaper fastening system including at least one elastomeric connection tab disposed at a side portion of the diaper. The connection tab has a body portion of stitch-bonded construction including an elastomeric expansion zone. The elastomeric expansion zone includes an inelastic stitching substrate of fibrous material with a plurality of accordion pleats and a zigzag network of elastomeric yarns disposed in underlying relation to the pleats. The zigzag network is adapted to apply contracting forces to the stitching substrate in the length dimension of the connection tab.