Plural of Chesterfield: a type of deep-buttoned upholstered sofa, or in some regions, a formal overcoat with a velvet collar.
Named after either the 4th Earl of Chesterfield or a London furniture manufacturer; the term became so associated with this distinctive furniture style that it's now used generically. The coat variant emerged later as a fashion item.
The Chesterfield sofa is so recognizable that it's shown up in thousands of movies and TV shows as 'the fancy couch,' making it probably the most famous sofa design in the world without most people knowing its actual name.
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