In this dissertation, I explore how the twelfth-century poet Marie de France combines animals and clothing to define and teach noble conduct in her Lais collection. I suggest that the nexus she creates between animals, dress, and virtue is chimeric but consistent, appearing differently in each narrative situation but recurring as a means of demonstrating moral conduct. My chapters explore three of her lais that combine beasts and attire to address the unique way Marie features the animal-clothing combination in each to teach distinctive lessons in virtuous behavior. My chapter on Guigemar argues that Marie uses the magical hind and the exchange of a knotted shirt and a belt to rework Ovidian anti-love themes to teach the value of being tightly bound in loyal love. Chapter 3 analyzes the eponymous knight's removal of his clothing as the mechanism that triggers his appearance as a werewolf in Marie's lai Bisclavret. I show that Bisclavret's werewolf form is like a sartorial skin under which his selfhood remains unaltered rather than a true transformation, and I argue that Marie uses the knight's appearance as a wolf so that the loyalty he demonstrates to his king and his homosocial community becomes voluntary and therefore serves as a model of noble conduct to the reader. Chapter 4 discusses Marie's use of the characters' relationships to animals and dress in her lai Lanval to assert the importance of a feminine contribution to leadership in society.