Tunicella
The tunicel is the proper outer garment characteristic of subdeacons.
From the 11th century, the tunicel hardly differed from the dalmatic worn by deacons except when worn by the bishop under the chasuble to be used in pontificals. However, since the IX century in which its first notice is available, its structure was that of a simple tunic without ornaments or less ornate and narrower than the dalmatic itself. In imitation of her, dalmatics were made from the IX century for the use of acolytes to be used in very solemn functions.
With the exception of institutes of consecrated life and societies of apostolic life that have permission to exclusively use the 1962 form of the Roman rite and maintain the subdiaconate, tunicelas are used in sporadic cases, either in the context of traditional liturgical celebrations, well dressed by acolytes in some places, especially from the Hispanic tradition.