I wear a 8.5 in most cases, I am also flat footed. My feet fit inside them but the narrowness of the shoe grips the sides of my feet like no other, not very comfortable. There is space in the shoe for my toes though, so it's not the size I ordered. I wouldn't recommend these shoes to flat footed individuals unless there is wide foot variety tagged somewhere in the post. They are the originals, good material, and look very cute, unless I break them in, they will most likely go to my sister