Lower-body garment with a combined stretchably-retained, fastenably-split waist. The waistband is sleevelike and split by overlapping ends having circumferentially opposing mouths. A stretchable band is encapsulated in, and unfixed entirely throughout, the waistband. The stretchable band has opposing ends passing out of the opposing mouths in the waistband and coupled into an endless loop by a coupling device for adjusting the length of the stretchable band. An unfastenable locking mechanism is provided on the overlapping ends of the waistband. Opening/closing portions are formed by at least one split in a predetermined location in the garment body, extending to a common terminal position and continuous with the split in the waistband.