Transvestic fetishism has historically been described as a "paraphilia" or sexual disorder. Currently, there is serious debate about the degree to which fetishes like transvestism should be considered "disorders" as opposed to merely variations in the vast landscape of sexual tastes and proclivities.
More About Transvestic Fetishism
According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-V), transvestic fetishism generally involves cross dressing and gaining erotic pleasure from that act. It has only been documented in heterosexual males. Many have argued, however, that this clinical definition merely amounts to labeling any gender expression not typically associated with assigned birth sex as pathological and sexually deviant and therefore essentially punishing sexual gender nonconformity.