Turned Into A Girl By Magic Story -

An old rival or a slighted sorceress uses the transformation as a "lesson" in humility.

A god or spirit decides the protagonist needs a completely new perspective on life to fulfill a prophecy. The "New World" Experience turned into a girl by magic story

The comedic struggle of trying to make "old life" clothes work for a "new life" body, leading to a desperate quest for a seamstress or a new outfit. An old rival or a slighted sorceress uses