Tunicle

noun

1. A small tunic.
2. A vestment worn by an archdeacon.

   "1845, In illustrating his views on the Popish tendency of these rubrics, the rev. gentleman particularly referred to the use of the alb, and cope, and tunicle, by the clergy in the discharge of their official duties. — The Times, 11 Jan 1845, p.5 col. D"

3. A tunica; a membrane or membranous sheath of skin.