Clinical or formal term for a person who dresses in clothing typically associated with the opposite gender. In everyday conversation, トランスジェンダー or 女装/男装 are more common depending on context.
It took him a long time to accept himself as a transvestite.
その論文は服装倒錯者の心理について詳しく分析している。
The paper analyzes in detail the psychology of cross-dressers.