A light wrapper or coat, usually of brown linen, to keep out the dust in travelling.

1

1864.  G. A. Sala, Daily Telegraph, Oct. 13. (N.E.D.)

2

1870.  The day after you left us Rose discovered your thin coat, which she called a “duster.” I had half a mind to confiscate it, it was such a good one.—J. R. Lowell, ‘Letters’ (1894), ii. 67–8. (N.E.D.)

3

1876.  [The people] don’t have time to take their dusters off; they come in their dusters, they eat in their dusters, and to the best of my belief they sleep in their dusters.N.Y. Tribune, Sept. 23 (Bartlett).

4

1883.  A medley crowd of human beings, clad for the most part in brown holland coats, or “dusters,” rushes tumultuously into the tepid saloon.—D. Pidgeon, ‘An Engineer’s Holiday,’ p. 108 (Lond.).

5