those are usually referred to as "babydoll" heels.  I still have a pair that my grandmother had when she graduated high schoolin 1944 she gave them to me when I was 17....they were SO comfy, to bad my feet got bigger.
whats that saying from steel magnolias
I wear a size 6 but a 7 feels so good I wear an 8?  or something like that 
 
