She told The Oxford Student newspaper: "In future there will be no need for transgender students to cross-dress to avoid being confronted by invigilators or disciplined during their exam."
Under the old laws on academic clothing - known as subfusc - male students were required to wear a dark suit and socks, black shoes, a white bow tie and a plain white shirt and collar under their black gowns.
Female students had to wear a dark skirt or trousers, a white blouse, black stockings and shoes and a black ribbon tied in a bow at the neck.
If a transgender student wanted to wear subfusc of the opposite sex they had to seek special dispensation from university proctors, who had the power to punish those who breached the rules.
An Oxford University spokesman said: "The regulations have been amended to remove any reference to gender, in response to concerns raised by Oxford University Student Union that the existing regulations did not serve the interests of transgender students."