Source : Webster's Revised Unabridged Dictionary (1913)

Tights \Tights\, n. pl.
   Close-fitting garments, especially for the lower part of the
   body and the legs.

Source : WordNet®

tights
     n 1: skintight knit hose covering the body from the waist to the
          feet worn by acrobats and dancers and as stockings by
          women and girls [syn: {leotards}]
     2: man's garment of the 16th and 17th centuries; worn with a
        doublet [syn: {hose}]