Petite

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late 18th century: French, feminine of petit ‘small’.

wiktionary

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Borrowed from French petitef, feminine of petitm(“small, little”).

etymonline

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petite (adj.)

"little, of small size," usually of a woman or girl, 1784 (from 1712 in French phrases taken into English), from French petite, fem. of petit "little" (see petit). As a size in women's clothing, attested from 1929.