I have decided to dress my boy in a WICKED MAGICIAN costume,
which is also easy and since my boy is in preschool , it is very difficult to expect him to cooperate with the uneasy costumes.
You will need a wooden stick, covered with silver/gold gift paper to be used as The Magic Stick. Dress your child in black pants and a black shirt and an eye mask and he/she could say The Magic Word "ABRAKADABRA"
and say dialogues to his friends like "I can change you into a frog or etc.
Thanks to Naren for this fun clever idea!