Abstract: A method of using a composite waste-containment garment comprising a disposable, elasticized waste-containment insert secured by means integral with the insert inside a non-elasticized over-garment such as a conventional reuseable diaper, or a disposable diaper, or overpants, or the combination of a non-elasticized reuseable diaper covered with an outer-garment such as overpants having elasticized leg cuffs. The insert is so elasticized along its longitudinal side edges that, when properly secured inside a suitable over-garment, and the over-garment is properly applied to a wearer, the elasticized side edges of the insert are sufficiently tensioned to form liquid seals or leg cuffs along upper thigh regions of the wearer: particularly, along the inner spans of the upper thigh regions of the wearer.