Definition of "wrapper"

Messy trains are horrible, but you can sort of understand passengers leaving their sandwich wrappers and paper cups if there is nowhere to dispose of them.

2023 April 5, Pip Dunn, “'196s' giving commuters a smoother ride”, in RAIL, number 980, page 55

Please to examine, at your leisure, the inner linings of the cuff of his left sleeve, and the several little packages which may be found in the somewhat capacious pockets of his embroidered morning wrapper.

1839, Edgar Allan Poe, William Wilson

It was eight o'clock to-morrow evening when I buckled up my travelling writing-desk in its leather case, paid my Bill, and got on my warm coats and wrappers.

1855, Charles Dickens, “The Holly-tree. Third Branch—The Bill”, in Christmas Stories […] (The Works of Charles Dickens; XV), de luxe edition, London: Chapman and Hall, published 1881, page 63