Definitions for "Cotta"
A surplice, in England and America usually one shorter and less full than the ordinary surplice and with short sleeves, or sometimes none.
a short robe often worn by choir members over cassocks. ( Photos courtesy - Robert Gaspard Co.)
a short, white outer garment often worn by choir members and acolytes to cover their cassocks
A kind of very coarse woolen blanket.