AskHistorians, 
It ghosts without saying that /u/thejukeboxhero writes some amazing posts. Check out this one on how ghosts became associated with floating white sheets! #GhostStories #Halloween @histodons
https://www.reddit.com/r/AskHistorians/comments/6s91la/how_did_ghosts_become_associated_by_white_sheets/dlea92h/