tunicle

noun3

1. •
   A vestment worn by a subdeacon at celebrations of the Eucharist.

   • He longed for the minor sacred offices, to be vested with the tunicle of subdeacon at high mass […]. — 1916
2. •
   A tunica; a membrane or membranous sheath of skin.
3. •
   (no longer used) A small tunic.