The semiotics of dress is the study of design and customs associated with dress (clothing), as patterned to a kind of symbolism that has rules and norms. It describes how people use clothing and adornments to signify various cultural and societal positions. "Semiotics" is defined as the philosophical study and interpretation of signs. The semiotic system is not limited to just verbal communication. Therefore, the term "semiotics of dress" can be further referred to as a non-linguistic semiotic resource which interrelates with facial expressions, gestures and body semiotics in an effort to develop and communicate meaning. People develop meaning of signs and signals based on an individual and personal ideology. It is important to note that clothing and fashion, by definition, are not the same. While clothing is defined as "any covering of the human body", fashion is defined as the style of dress accepted by members of a society as being appropriate for specific times and occasions. The human body is the key element of this non-linguistic semiotic resource. The way one dresses is informed by the biological and social needs of the individual. Central to the semiotics of dress is the psychology of self-perception and self-presentation, both as individuals who see themselves, as well as how individuals are seen within a greater group, society, culture or subculture. When the term semiotics is applied to dress, it refers to the words and symbols used to describe the images supporting "the structure of social interaction". Examples of these social interactions include: the system of statuses and roles. Therefore, the way one dresses can be analyzed as a symbol mechanism to communicate ideas and values with other members in a society, as sociologists Erving Goffman and Gregory P. Stone have suggested. Clothing is a visual signifier that can be interpreted differently based especially on context and culture. Fred Davis expressed the difficulty of understanding and interpreting clothing and fashion.