'' The Girl on a Motorcycle '' ( French : '' La motocyclette '' ) , also known in the United States as '' Naked Under Leather '' , is a 1968 British-French erotic romantic drama film starring Alain Delon and Marianne Faithfull and featuring Roger Mutton , Marius Goring and Catherine Jourdan . It was listed to compete at the 1968 Cannes Film Festival but the festival was cancelled due to the May 1968 events in France . '' The Girl on a Motorcycle '' redefined the leather jacket for motorcyclists into a full body suit that Marianne Faithfull wore in the film . It was the first film to receive an X rating in the United States
1968 Cannes Film Festival
1968 Cannes Film Festival
The Girl on a Motorcycle