The Takarazuka Revue is a famous Japanese theater group. It's known for being all-female, with women playing any male roles in the story they're putting on.
Comparing a girl to one is a way of saying that they would look good in men's clothes/a male role.
@TheWorldRoseanna Which isn't as bad as that sounds. The Takarazuka vibe is very much the handsome beauty--stylish, dashing, idol/prince of the girls' school, kind of thing.