When you search for ghost costumes online, you'll find three major categories. The first is a simple white, flowing gown-type costume: your classic white bedsheet. The second is pop-culture ghosts, whether they're the murderer from the Scream movies (which was not a ghost, but whatever), Slimer from Ghostbusters, or a bold-striped Beetlejuice suit.
But the third, the Victorian Ghost, is more peculiar. It's ornate and complex, but not pegged to any particular horror franchise or touchstone ghost. Why does formal Victorian wear, like corsets and lace, read as "ghostly" to us?