Properly fitting pointe shoes is a science. Only a skilled fitter should assist an aspiring ballerina. And although many teachers have varying tastes and preferences, there are some basic principles that are very important in determining the proper fit of a pointe shoe.
Although online ordering has become the major source of shopping in these times, pointe shoe fitting is an art that is best done with the dancer in person. If an in person individual fitting is not feasible due to distance or other circumstances, an experienced fitter may be able to use an outline of the foot and other information to determine a good possible fit. Other factors determining the "right fit" would be the dancers experience level, numbers of days a week on pointe, hours a class on pointe, and the technique being used to rise on to pointe.