I ordered my daughter's normal shoe size... and they fit perfectly.  If I had ordered a size down (as the instructions advise) they would have been too small.  My daughter has a narrow foot... I wanted to order the "A" width, but they weren't in stock and I needed them right away.  Even with the normal "C" width, I was able to tighten the drawstring bow enough to fit her comfortably.  And I was happy that the elastic strap didn't need to be adjusted for her, as I've had to with other brand slippers in the past.  Overall, a nice enough.  I would purchase again.  I'm please with Bloch (their tights are the BEST).  And these shipped REALLY quickly.