Cross-Dressing

Cross-dressing is the act of wearing items of clothing not commonly associated with one's sex. Cross-dressing has been used for purposes of disguise, comfort, comedy, and self-expression in modern times and throughout history. Almost every human society throughout history has had expected norms for each gender relating to style, color, or type of clothing they are expected to wear, and likewise most societies have had a set of guidelines, views or even laws defining what type of clothing is appropriate for each gender. The term "cross-dressing" refers to an action or a behavior, without attributing or implying any specific causes or motives for that behavior. Cross-dressing is not synonymous with being transgender.

Learn more on Wikipedia