资料来源 : Webster's Revised Unabridged Dictionary (1913)

Toga \To"ga\, n.; pl. E. {Togas}, L. {Tog[ae]}. [L., akin to
   tegere to cover. See {Thatch}.] (Rom. Antiq.)
   The loose outer garment worn by the ancient Romans,
   consisting of a single broad piece of woolen cloth of a shape
   approaching a semicircle. It was of undyed wool, except the
   border of the toga pr[ae]texta.

   {Toga pr[ae]texta}. [L.], a toga with a broad purple border,
      worn by children of both sexes, by magistrates, and by
      persons engaged in sacred rites.

   {Toga virilis} [L.], the manly gown; the common toga. This
      was assumed by Roman boys about the time of completing
      their fourteenth year.

资料来源 : WordNet®

toga virilis
     n : (ancient Rome) a toga worn by a youth as a symbol of manhood
         and citizenship