Etymology
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pinafore (n.)

1782, "sleeveless apron worn by children," originally to protect the front of the dress, from pin (v.) + afore "on the front." So called because it was originally pinned to a dress front. Later a fashion garment for women (c. 1900).

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Definitions of pinafore

pinafore (n.)
a sleeveless dress resembling an apron; worn over other clothing;
Synonyms: jumper / pinny
From wordnet.princeton.edu