different between placket vs henley

English

From French plaquer (“to lay or clap on”). See placard.

placket (plural plackets)

A slit or other opening in an item of clothing, to allow access to pockets or fastenings
(obsolete) A petticoat, especially an underpetticoat.
(obsolete, slang, by extension) A woman.
(obsolete) A woman's pocket.
(historical) A leather jacket strengthened with strips of steel.
(historical) An additional plate of steel on the lower half of the breastplate or backplate.
Synonyms: placcat, placcate

From the town of Henley in England, where the rowers wore shirts of this type.

henley (plural henleys)

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