The present invention provides an engine enhancement system and method which utilizes hydrogen as a combustion catalyst within an internal combustion engine, the hydrogen preferably being obtained andor replenished from a supply of HHO gas fed to combustion chambers of the engine, and being located at interstitial sites in the walls of the combustion chambers. The garment can be incinerated so as to provide a disposable, one time use coverall particularly adapted for use in nuclearradioactive environments. The opening in the first sheet comprises a slit, one end of which terminates in an enlarged aperture.