In Ancient Greece, the people generally wore an off white tunic or dress, made of linen, with a toga style wrap. There are many different images of the Greek gods, but as they are fictitious, there is no set design for their dress.
My Greek citizen costume is made from polycotton so that is is cool and easy to wash. The goddess wears a poly cotton dress with gold organza toga. This fabric adds a bit of glamour and magic to the outfit.