I watched this movie when I was a kid and I would like to watch it again but I can't remember much about it. All I remember is that it was a children's movie from the '80s about a boy who somehow got to another world in another galaxy. I also remember that boy had some kind of an invisibility overall that made him invisible when covered with it. There was also a princess if I'm not mistakeing. The last scene in the movie was boy flying back home through universe. I would be very gratefull if someone could help me find this movie. Thanks

Sounds like Mio in the Land of Faraway (http://en.wikipedia.org/wiki/Mio_in_the_Land_of_Faraway)