"everywhere," O.E. ofer eall, from ofer "over" + eall "all;" sense of "including everything" is from 1894. Clothing sense (usually plural) of "loose trousers of a strong material worn by cowboys, etc." is from 1782. Specific sense "loose fitting canvas trousers with a bib and strap top" (originally worn by workmen over other clothes to protect them from wet, dirt, etc.) is attested from 1897.