A sacristan is an officer charged with care of the sacristy, the church, and their contents.
A sacristan
Le bedeau de Kerlaz, painting by Jules Breton (1868)
A sacristy, also known as a vestry or preparation room, is a room in Christian churches for the keeping of vestments and other church furnishings, sacred vessels, and parish records.
Sacristy with a sacristy credens (a cabinet with wide and very shallow drawers in which vestments and hangings are stored). A chasuble and stole are laid out on top of it, ready to be put on.
Interior of the sacristy at St. Michael Church in Keminmaa, Finland