Variations in personal appearance—clothing styles, hair color, grooming, accessories—do not always mean that a person has multiple personality

Persons with only one personality may have variations in their personal appearance. For example, they may dress differently at home and the office, but this does not prove they have different personalities at home and the office, even if their home and office behavior is different, too.

Variations in personal appearance are clues that a person has multiple personality only if they can be correlated with variations in knowledge, memory, name, age, gender, sexual orientation, talents, skills, interests, values, preferences, or beliefs.

So don’t jump to the conclusion that people you know have multiple personality just because they have variations in personal appearance.