Longcoat

At a table just inside the window sat a black-bearded man in a gray longcoat.

Source: wiktionary

My dad, Dr. Livesey, had his pocket watch dangling from his vest and wore a handsome gray longcoat, pink shirt, white trousers and shinny black leather shoes.

Source: wiktionary

Ahead of them the bodyguard Marsh was pushing the pace as best he could, though the tall figure in his stiffened longcoat had stopped for a moment beneath a withered jupe tree, where an equally withered old monk sat perched on a bench talking to a dog that was watching Marsh instead.

Source: wiktionary

The Chihuahua is the smallest breed of dog and is available in both the longcoat and shortcoat varieties.

Source: wiktionary