1A close-fitting cap worn by women (especially of high social status) in the 17th and 18th centuries, having a long flap or lappet on either side, sometimes worn fastened on the breast or pinned up on the head.
2An apron, usually with a bib; a pinafore. Compare pinny. Now historical and rare.
3A person who fastens or attaches something with a pin; specifically a person who pins pieces of paper bearing songs on a board, wall, etc., and offers them for sale (now historical ).
4A person who inserts the pins in the revolving cylinder of a barrel organ or (occasionally) a musical box.
Origin
Late 16th century; earliest use found in Of Good & Perfect Remembrance: Bolton Wills & Inventories. From pin + -er.