A Halloween costume is an outfit worn during the celebration of Halloween, which takes place on October 31st each year. People of all ages dress up in various costumes, often inspired by monsters, superheroes, or popular characters from movies and books. The purpose of wearing a costume is to have fun, express creativity, and sometimes to scare others. Costumes can be homemade or purchased from stores, and they vary widely in style and complexity. Many people also accessorize their costumes with items like masks, makeup, or props to enhance their look. Overall, Halloween costumes play a significant role in the festive spirit of the holiday.