Meaning

noun a one-piece cloak worn by men in ancient Rome

originBorrowed directly from Latin toga, from tegō (“to clothe”). Doublet of toge. The Philippine (and Indonesian) senses are due to the resemblance of the white ceremonial gowns worn by graduates of institutions to the loose outer garment worn by the citizens of Ancient Rome.

Etymology from Wiktionary, CC BY-SA 3.0