Ordered size 12.5 for my daughter who wears an 11 in street shoes and they are slightly roomy, but the shape of these shoes and the drawstring makes them easy to fit to her foot.  In fact, my other little girl wears a 9 in street shoes and is wearing the size 12.5 ballet shoes right now, and they are staying on and comfy for her.  Ordered these for house shoes so don't know how they would do for actual ballet dancing.  But they are sturdy, pretty, well-made, and my daughters love them.