These fit pretty much true to size.
Unlike full-length shoes, a d'Orsay shoe is often completely split leaving the middle of your foot exposed. This means that if your foot is wider than the opening of the front part of the shoe, you will not be able to wear it comfortably. We tried these on many dancers and those with wide feet were not able to wear them.
Sizing: Most women know which two sizes they fit best (like 6.5 & 7 or 8.5 & 9). To figure out which size you'll fit in these: