Etymology
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tights (n.)

1827, "tight-fitting breeches," from tight. Meaning "skin-tights worn by dancers, acrobats, etc." is attested from 1836.

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Definitions of tights

tights (n.)
skintight knit hose covering the body from the waist to the feet worn by acrobats and dancers and as stockings by women and girls;
Synonyms: leotards
From wordnet.princeton.edu