Signature look

Trademark look or signature look is an informal term for the characteristic clothes or other distinguishing signs used by a certain character or performer, making the person more recognizable by the audience. Politicians may also have trademark signs, such as the suit of American President Barack Obama or the Merkel-Raute of German Chancellor Angela Merkel. It can also refer to the clothes of a certain subculture.

Sometimes, when a celebrity stops using a trademark look, people might even find it hard to recognise them.

The term is not used in trademark law and a trademark look is not necessarily trademark protected in itself.

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Wikipedia