Where did Halloween costumes originate?

Where did Halloween costumes originate?

Halloween masks and costumes were used to hide one’s attendance at pagan festivals or—as in traditional shamanism (mediated by a witch doctor or pagan priest) and other forms of animism—to change the personality of the wearer to allow for communication with the spirit world. Here, costumes could be worn to ward off evil spirits. On the other hand, the costume wearer might use a mask to try to attract and absorb the power of the animal represented by the mask and costume worn. According to this scenario, Halloween costumes may have originated with the Celtic Druid ceremonial participants, who wore animal heads and skins to acquire the strength of a particular animal.

An additional layer of tradition explaining the origin of Halloween costumes comes from the medieval Catholic practice of displaying the relics of saints on All Saints’ Day: “The poorer churches could not afford relics and so instituted a procession with parishioners dressed as the patron saints; the extras dressed as angels or devils and everyone paraded around the churchyard.”
Going from door to door seeking treats may result from the Druidic practice of begging material for the great bonfires. As we will see later, it is also related to the Catholic concept of purgatory and the custom of begging for a “soul cake.”
As for the “trick” custom of Halloween, this is related to the idea that ghosts and witches created mischief on this particular night. For example, if the living did not provide food, or “treats,” for the spirits, then the spirits would “trick” the living. People feared terrible things might happen to them if they did not honor the spirits. The Druids also believed that failure to worship their gods would bring dire consequences. If the gods were not treated properly in ritual, they would seek vengeance. This was therefore a day of fear. Further, some people soon realized that a mischievous sense of humor, or even malevolence, could be camouflaged—that they could perform practical jokes on or do harm to others and blame it on the ghosts or witches roaming about.