As a noun robe
is a long, formal dress worn only on special occasions.
As a proper noun toga is
A long loose outer garment, often signifying honorary stature.
(US) The skin of an animal, especially the bison, dressed with the fur on, and used as a wrap.
- Through tattered clothes small vices do appear; / Robes and furred gowns hide all.
To clothe someone in a robe.
Loose outer garment worn by the citizens of Rome.
Loose wrap gown.
* toga party