disposable absorbent clothing, such as diapers or training shorts, and its manufacturing process. disposable absorbent diaper including a topsheet, a backsheet and an absorbent core disposed between the topsheet and the backsheet. the topsheet, the backsheet and the absorbent core form a layered assembly including a front region, a back region and a leg region disposed between the front region and the back region. The garment is characterized by a vertical longitudinal plane extending substantially centrally through the front, back and between the legs. each of the front and rear regions includes a pair of flap portions extending in substantially opposite lateral directions with respect to the longitudinal plane. each flap part is a breathable stretch layer assembly having a number of ventilation locations. In addition, each flap portion includes an outer layer, which is an extension of the backsheet and extends laterally to the side edge of the flap portion, and an inner layer, which is an extension of the topsheet and also extends laterally. to the lateral edge of the flap portion. the flap portion also includes a layer of stretch material secured between the inner layer and the outer layer. the top sheet includes a central section which is generally disposed in a central section of the garment and over the core. each section of a pair of side sections of the topsheet extends laterally and forms the inner layer of two of the flap portions. The side section also forms an outer wall section of a leg barrier extending longitudinally along the lateral face of the core. An inner wall section of the leg barrier is a portion of a substantially impermeable material extending below the leg barrier to closely bond the side edge of a polymeric film barrier disposed below the core. the substantially impermeable material and the polymeric film barrier combine to form a substantially impermeable retaining structure around the sides and bottom of the core. In a method of forming