I just got my first pair of zizi's and they are swell!!! I forgot to get it a size larger (stupid me!!!) but they fit fine. I bet the soft leather will stretch anyhow, like my normal leather ballet shoes.
The Zizi's are SO comfy that I'm totally a fan of Repetto now. I want a pair of their ballerina flats. I love your pink patent version, leyla! Did you get a size larger?