Size is true to size, maybe a half size larger is good, depending on your feet. We have 4 of the colors, hard to find round toe ballet flats right now. The insides are fuzzy on the sides so you don't need a sock, and they have a good heel cup to hold themselves on your feet. Good cushioning too.
I have slightly wide feet and have difficulty finding ballet flats that are comfortable and look good on my feet. These fit perfectly in my usual size (7.5), and the style goes with almost everything. I bought them as spares to wear on days when I might ruin my more expensive pair of ballet flats. I got them in black.