A sheath for carrying a knife in conjunction with a pistol holster. The sheath includes a first fastener and a second fastener. The sheath includes an internal volume defining a shape to receive the knife blade. The internal volume has a closed end and an open end. The knife sheath includes a pivot fastener to pivotally fasten the sheath to the pistol holster first fastener and an angle-adjustment fastener to fasten the sheath to the pistol holster second fastener and provide angle adjustment.