:rolleyes:
Back off man i'm a scientist
Do ghosts, as in strange things happening that can not be explained? yes. I've seen solid objects moved or otherwise displaced when there is no normal force affecting them (not even wind)
As to why ghosts wear clothes, that can be explained (in theory at least). If a ghost is some sort of psychic footprint then they wear clothes because they chose to. Similar to the "residual self image" Morpheus used to explain to Neo in The Matrix.
Those willowisps are weird creatures and the problem is when you delv into ghosts you may have to consider folklore like fairies and sprites. When they were in Ireland the ghosthunters visited one area believed to be inhabited by the "wee folk" not exactly sure if it was leprechauns they were primarily searching for.