Athena's torso at the Agora of Athens
This large Athena wears a peplos pinned at each shoulder, belted at the waist with a double cord, and a mantle bunched over her right  shoulder. 
She is clearly identified by the narrow, folded aegis draped diagonally across her chest. 
Between the breasts, on the aegis, is a  small head of Medusa. 
Snakes were once added in bronze, although on the back they too were of marble. 
The right arm extended outward,  probably to hold a spear. 
The left was close to the body, possibly resting on a shield.
The torso was found south of the Temple of Ares.
Since Pausanias saw a statue of Athena there, which  he attributed to a Parian sculptor named Locros, this torso is often associated (Paus. 1.8.4).
About 425-400 BCE, Over life-size
Athens, Agora Museum

(Click the image for a full screen view)