[count] a piece of clothing that is worn on your upper body over another piece of clothing (such as a shirt) :a usually short and light coat

see color picture - see also dinner jacket, flak jacket, life jacket, sports jacket, straitjacket

an outer covering: such as

a paper cover that protects a book and that can be removed :dust jacket

b chiefly US :a paper, cardboard, or plastic envelope for holding a record, CD, or DVD - called also sleeve, - see also yellow jacket