The process of Ghost Mannequin is Photo retouching service for catalogs and e-commerce sites. For those purposes the mannequins are used instead of human figure to create 3D effect of various garment items, like: shirts, trousers, jacket, cardigan, swim suits, lingerie, etc. and often jewelries as well.
In the final output, the background and the mannequin is removed after photo retouching which gives it a hollow or ghostly look. This is called Ghost Mannequin Effect, which is also known by Invisible Mannequin Effect. The same effect can be rendered by using Transparent Mannequins or Removable Ghost Mannequins.