1. A MASKING DEVICE IN THE FORM OF A DUMMY OF A HUMAN BEING, SAID DEVICE HAVING A HOLLOW SHELL BODY IN THE SHAPE OF A FRAGMENT OF THE FRONT OF A HUMAN BODY INCLUDING A TORSO, ARMS AND LEGS OF THE HUMAN BODY, SAID SHELL BODY SEMI-CIRCULAR IN CROSS-SECTION AND ADAPTED TO FIT OVER THE HEAD OF A WEARER OF THE DEVICE, SAID SHELL BODY HAVING A PROTUBERANCE IN SIMULATION OF THE HUMAN NOSE, AND HAVING A PAIR OF SPACED OPENINGS IN SIMULATION OF HUMAN EYES, THE OUTER SURFACE OF THE TORSO AND ARMS HAVING MARKINGS SIMULATING A JACKET WITH LAPELS AND A VEST, THE OUTER SURFACES OF THE LEGS HAVING MARKINGS SIMULATING TROUSERS, SAID NOSE SIMULATING PROTUBERANCE DISPOSED BETWEEN SAID LAPELS, SAID EYE SIMULATING OPENINGS DISPOSED IN SAID LAPELS, AND AN ELASTIC BAND ADJACENT ONE END OF THE BODY FOR HOLDING THE SHELL BODY ON THE HEAD OF THE WEARER IN UPSIDE DOWN CONDITION.