1. Feature, characteristic, peculiarity refer to a distinctive trait of an individual or of a class. Feature suggests an outstanding or marked property that attracts attention: Complete harmony was a feature of the convention. Characteristic means a distinguishing mark or quality (or one of such) always associated in one's mind with a particular person or thing: Defiance is one of his characteristics. Peculiarity means that distinct or unusual characteristic that marks off an individual in the class to which he, she, or it belongs: A blue-black tongue is a peculiarity of the chow chow.

Did you mean underdress?