A dark trench coat with a silver scarf and lapel, along with the matching hat, the Silver Shroud costume is that of the Hubris Comics character the Silver Shroud. It is almost identical to the one featured in Fallout 4, except for the color of the buttons on the coat.
This outfit can be purchased from the Atomic Shop for 2000 Atoms.
This article is too short to provide more than rudimentary information about the subject. You can help Nukapedia by expanding it.