All I know is that the main characters are sisters, an older sister and a younger sister. The younger sister, I guess is jealous of her older sister's beauty. The younger sister is given a magical raggy dress and the older sister was given something special, I think a mirror, I could be wrong. The two sisters and their father are on a ship.(I remember a scene with a ship!). The whole moral of the movie is about inner beauty.

Found it.it is called Voyage of the Unicorn