Pinner

 
A pinner was a woman's cap with two long flaps or lappets pinned on, worn in the 17th and 18th centuries.

A pinner can also be the 'agent noun' from the word pin, simply meaning one who pins.

But the context in which I came across it recently did not fit either of these definitions. So when I checked it out further I discovered that in days gone by a pinner was a sort of constable who impounded stray animals until their owner could be found. The animals would be held in a pinfold - a small enclosure, usually walled, some of which remain in scattered English villages.