A strait jacket is disclosed, which is adapted to fit wearers of more than one clothing size. The strait jacket has a jacket torso body comprising at least two panels, each panel terminating at a lower edge located adjacent to but below the wearer's underarms. Sleeves extend from the torso body to distal ends, and each sleeve has a length greater than the length of the wearer's arms. The distal end of each sleeve includes a fastening device to permit the sleeve to be fastened to the opposite sleeve and to a belt by suitable fasteners at a position behind the wearer's back. An annular jacket collar is located above the jacket torso body, and a strap extends downwardly from the collar. In one embodiment of the invention, the strap extends under the wearer's crotch. A belt strap is adapted to be secured about the wearer's mid rib cage and is further adapted to be attached to the chest strap at a posterior position; and, if desired, at an anterior position.