Mysterious Stranger Outfit (Fallout 3)

The Mysterious Stranger outfit and Mysterious Stranger hat are worn by the Mysterious Stranger in Fallout 3 and Fallout: New Vegas. The Mysterious Stranger outfit is also worn by Miss Fortune in Fallout: New Vegas, appearing as a dramatically different piece of clothing when worn by a female.

Location
They cannot be obtained without using console commands.

Behind the scenes
The suit is a nod to the classic film noir style detective, i.e. long overcoat with a shady hat pulled over their face.