Students at Ethan Chase Middle School in Menifee were encouraged to wear Disney costumes for spirit day on Thursday.
Austin Lacey, 13, chose to dress as Elsa from the movie "Frozen."
The eighth-grader told KTLA that his classmates loved the idea and asked him to pose for selfies.
But, the school principal apparently felt it was inappropriate and told him to take off the costume.
A statement from Romoland School District Superintendent Dr. Julie Vitale read in part:
"This action was taken in accordance with district policies. At no time was there an indication that the student was expressing any particular message. The Principal's action was based upon the need to stop a general disruption to the school environment," Vitale stated.