Meanings of old greatcoat in English

I bet he's still addicted to Glenn Miller and wearing that old greatcoat!'

A black forage cap lay by his side, and an old greatcoat was draped around his shoulders.

He wore his old greatcoat.

In place of the tall, dark-haired, and youthful-looking aristocrat was a stooped, grey-haired figure in a dirty shirt and a shabby old greatcoat.

A thin intense presence wrapped in a filthy old greatcoat, he strolled unconcerned past the bodies of dead gods and didn't give a damn.

'And you were wearing that old greatcoat.