I typically wear a 9, but go to an 8.5 in these. This is probably my 5th pair of this exact same shoe - love the shoe for work (don't give me blisters, comfy, look good!), but I have to keep replacing them after a little while because the bottom becomes detached from the sole eventually (not instantly, but it's happened with every pair except 1!). Haven't found another patent black flat that  I like and fits as well as these, so I guess I'll keep buying them...