coverall(n = noun.artifact) - a loose-fitting protective garment that is worn over other clothing;
is a kind of protective garment
has particulars: dust coat, duster, gabardine, gaberdine, smock, jumper, boilers suit, boilersuit, overall

   a loose-fitting one-piece garment that is worn over other clothing, especially one with trouser-like pants legs. [WordNet 1.5]

coverall, n. & adj. esp. US
--n.
1 something that covers entirely.
2 (usu. in pl.) a full-length protective outer garment often zipped up the front.
--attrib.adj. covering entirely (a coverall term).