Do Mormons wear “magic underwear" as stated in the Heretic movie?

What’s up with the talk of “magic underwear” in the Heretic movie? During a provocative scene in the movie, a mischievous group of girls pulls down the skirt of one of the sister missionaries, embarrassingly revealing and filming her temple garments. These “magic underwear” or “Mormon underwear,” as they are derogatorily referred to by some, are a recurrent topic throughout the movie. 

These articles of clothing are considered sacred by members of the Church of Jesus Christ of Latter-day Saints. When adult members of the church enter temples of their faith, they make covenants or promises with God to obey His commandments. As part of the ceremony where these covenants are made, members receive a simple undergarment known as the “temple garment” or “garment of the Holy Priesthood.” The garment is white and is “[s]imilar in design to ordinary modest underclothing” and “comes in two pieces.” These garments are to be “worn underneath members’ normal clothing for the rest of their lives, serving as a daily physical reminder of their covenant relationship with God.” This practice hearkens back to the Book of Exodus where holy garments were made for and placed upon Aaron, Moses’s brother and priest in the tabernacle (Exodus 28:2-3; 40:12-13). 

The movie’s desire to poke fun or make light of something held sacred by millions throughout the world is uncouth and offensive to members of the church. The church has stated that “…[t]here is nothing magical or mystical about temple garments, and Church members ask for the same degree of respect and sensitivity that would be afforded to any other faith by people of goodwill.”