A diaper having a releasable fastening system, the fastening system comprising: a fastening tab including a segment of hook material having a plurality of outwardly projecting hooking elements; and a segment of loop material of stitch bonded construction disposed at a portion of the diaper remote from the fastening tab, the segment of loop material including a plurality of outwardly projecting loop elements adapted to engage the hooking elements in juxtaposed contacting relation, wherein the loop material comprises a composite sheet of stitch bonded construction including a multi-layer nonwoven stitching substrate with a first plurality of yarn elements extending in stitched relation through the stitching substrate to define a ground layer of flat stitches, and wherein the composite sheet of stitch bonded construction further includes a second plurality of yarn elements extending in stitched relation through the stitching substrate in crossing relation between parallel needle lines to define said plurality of outwardly projecting loop elements extending above the ground layer of flat stitches, wherein the loop material has a weight of not greater than 65 grams per square meter, characterised in that the multi-layer nonwoven stitching substrate comprises at least one layer of a cellulose tissue disposed in surface covering relation to at least one layer of a nonwoven support material of polymeric fiber, and the loop material has a Frasier air permeability of not greater than 3681 liters per minute (130 cubic feet per minute) per 929 cm 2 (1 square foot) at a differential pressure of 124.54 Pa (0.5 inches of water) when measured in accordance with ASTM D737. a fastening tab including a segment of hook material having a plurality of outwardly projecting hooking elements; and a segment of loop material of stitch bonded construction disposed at a portion of the diaper remote from the fastening tab, the segment of loop material including a plurality of outwardly projecting loop elements adapted to engage the hooking elements in juxtaposed contacting relation, wherein the loop material comprises a composite sheet of stitch bonded construction including a multi-layer nonwoven stitching substrate with a first plurality of yarn elements extending in stitched relation through the stitching substrate to define a ground layer of flat stitches, and wherein the composite sheet of stitch bonded construction further includes a second plurality of yarn elements extending in stitched relation through the stitching substrate in crossing relation between parallel needle lines to define said plurality of outwardly projecting loop elements extending above the ground layer of flat stitches, wherein the loop material has a weight of not greater than 65 grams per square meter, characterised in that the multi-layer nonwoven stitching substrate comprises at least one layer of a cellulose tissue disposed in surface covering relation to at least one layer of a nonwoven support material of polymeric fiber, and the loop material has a Frasier air permeability of not greater than 3681 liters per minute (130 cubic feet per minute) per 929 cm 2 (1 square foot) at a differential pressure of 124.54 Pa (0.5 inches of water) when measured in accordance with ASTM D737.