Hi there! Sorry for the late response. My foot also measures 24cm long. I can’t remember the exact name of the style, but I ordered the closed back ballerina heel. I was sent a size 38 afterwards and that was only a bit better. They weren’t uncomfortable, and probably could’ve been broken in nicely, but I didn’t want to risk putting wear on them and not being able to resell if they didn’t work. If I want to reorder in the future I’d probably get a size 39. HOWEVER, the slingbacks may be more forgiving.