I am a big fan of this particular style of shoe.  I am normally 6.5 or 7 medium width foot.  I tried on both the 7 and 7.5.  The 7 fit but only with tights.  The 7.5 fit with room to spare for a thin sock.  I have found in the past that Etienne Aigner shoes run slightly narrow for me.  I purchased and kept the black pair in a 7.5.  They are really comfortable and the soft plastic sole on the ball of foot helps keep the noise level down when walking.