I actually have a pair of the Mary Janes and they fit much differently than the regular crocs. Have you tried the regular ones? I find them more comfortable than the Mary Janes, but they Mary Janes are much cuter, so I like them both for different things. If you want to buy the Mary Janes, I would recommend getting whichever size seems more comfy in the story, then take them home and wear them around the house for a day. That's when I was really able to decide if I liked the shoes or not.