I did a little research on inexpensive doll ballet sets to buy if you want Isabelle. All of these are Springfield sets, sold on Amazon, their website, and in Micheals. I really love that all of these sets are sold at nine dollars or under. I am probably going to buy all three!
Doll Gymnastics Set
Decorate Your Own Tutu Set
(You don't have to decorate the tutu, I won't)
Doll Ballet Shoes