The armor does not appear to exist within Fallout 4, and was likely fan-made for the sake of the image. Per Nolonar's comment and Google Reverse Image Searching, the screenshot appears to be taking from this Youtube video.
Various comments on the video state that the is not within the game
User: I wish the armor in the thumb nail was actually in the game
User: what is the armor hes wearing in the thumb nail?
Response: it's not actually armor