See quotations.

1

1725.  I have lost nothing but a banyan shirt, &c.—‘Harl. Misc.,’ viii. 297. (N.E.D.)

2

1774.  Had on, when he went off, a Callico Banyan.—Boston Gazette, Sept. 5 (Burlesque advertisement).

3

1774.  Carried away with him a Callico Banyan, &c.—Id., Oct. 3. (Runaway advertisement.)

4

1833.  In the summer season, men very often wore calico morning-gowns at all times of the day and abroad in the streets. A damask banyan was much the same thing by another name.—Watson, ‘Historic Tales of Philadelphia,’ p. 117.

5

1867.  

        His coat was brownish, black perhaps of yore;
In summer-time a banyan loose he wore.
J. R. Lowell, ‘Fitz-Adam’s Story.’    

6