Abstract: The trousers with adjustable waistline comprises a pair of pants. The pants are further defined with a waistband. The trousers with adjustable waistline comprise a plurality of pleats. The trousers with adjustable waistline is formed with a plurality of pleats in the waistband. The plurality of pleats allows the span of the waist perimeter formed by the waistband to be adjusted. Each of the plurality of pleats is formed with a fastener. The fastener of a selected pleat holds the selected pleat together when the fastener is fastened. When the fastener is unfastened, the selected pleat releases the material gathered within the selected pleat in such a manner that the span of the waist perimeter formed by the waistband is increased. The span of the waist perimeter can be decreased by fastening the fastener thereby regathering the material that forms the selected pleat.