Frank and the Handkerchief

My wife and I always used to joke about "Frank", the mischievous ghost in our former 1940s home. We would frequently feel as though we were being watched when we were alone in the home, although one particular experience still makes the hair on my arms stand up several years later. I was on our second floor one evening, carrying a load of laundry from our basement up to our bedroom closet. When I entered the closet and turned on the overhead light, I saw what appeared to me as a black silk handkerchief... Hovering in the middle of the closet in front of me. Whatever it was hovered there for approximately 1-2 seconds, then dropped "through" the carpeted floor. To this day, I would SWEAR that the object was a tangible, three-dimensional object! I don't remember it casting any type of shadow, but it had a "shiny" surface that I could not see through, and was approximate 6-8 inches tall and 3-4 inches wide. The legend of "Frank" grew as a result, though that scared me... And is something I am hoping not to encounter again in the future.