In short, the foot runs narrow and the toe room is an extra inch longer than usual.  I bought a 6.5B because most reviewers say to buy 1/2 size smaller or the lower end of the usual size.  They were too narrow and way too much toe room.  I just got the 5.5C today and it fits perfect!  So for me, it was at least one size smaller and wide width makes a better fit.  A little bit tight on the shaft but I have athletic calves.  I will only be able to wear sheer socks with these calves.  I recommend wide width if you have normal or are on the wider end.  Definitely buy one size smaller.  The comfort, style, and leather quality are superb!