If a fireman came to work in a police outfit or clown suit, that would be a clear case of nonconformity. Where there's nonconformity, there's difference.

When everyone is acting or dressing exactly the same, there's conformity, not nonconformity. Nonconformity means that someone is doing things differently from the norm. People in authority tend to dislike nonconformity, because it makes people harder to control. Someone who demonstrates nonconformity most of the time is a nonconformist. Too much nonconformity can create chaos, but without a little nonconformity, life would be pretty boring.

Definitions of nonconformity

n failure to conform to accepted standards of behavior

abidance, compliance, conformation, conformity
acting according to certain accepted standards
a lack of conformity with law or custom or practice etc.
Type of:
an act that fails

n a lack of orthodoxy in thoughts or beliefs

nonconformance, nonconformism
conformism, conformity
orthodoxy in thoughts and belief
Type of:
heresy, heterodoxy, unorthodoxy
any opinions or doctrines at variance with the official or orthodox position

n unorthodoxy as a consequence of not conforming to expected standards or values

Type of:
heterodoxy, unorthodoxy
the quality of being unorthodox

n lack of harmony or correspondence

Type of:
the speech act of disagreeing or arguing or disputing

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