For the role, she had short hair and was outfitted like a man
As previously stated, portraying a trans character by a person of the opposite sex is often discouraged. As a general rule, there are a lot of trans actors out there who would be more than happy to portray the role of a transgender person. However, it’s going to take a long time for Hollywood to get up to speed.
Elle Fanning plays a transgender boy in the 2015 film Three Generations. In order to play a man, she wears short hair and a suit.