Sabha Parva 60.11

Having spoken thus to the son of Kunti, Duryodhana proud of his affluence, and desirous of encouraging the son of Radha (Karna) and of insulting Bhima, uncovered his right thigh, which was like a stem of the plantain tree or like the trunk of an elephant and which was graced with every auspicious mark, and endued with the strength of thunder; he showed it to Draupadi in her very sight.