My measurements

Feet

The measurements below were taken 2015.05.13 with a Brannock Device.
I used the instructions found on Brannock's website: http://brannock.com/pages/instructions-fitting-tips

Left foot:
- ~12.2(?) heel-to-toe
- ~12.5 heel-to-ball
Taking the higher of the two, that's 12.5, and since most shoes aren't made in half-sizes that means a 13.
Looking at the width for a size 13, it's directly between an 'A' and a 'B'. Brannock's website says, "If the shoe size falls between widths, choose a wider width for a thick foot, a narrower width for a thin foot." I've always considered myself to have a wide foot, but A and B are both narrow widths, so I'm not sure which I'm supposed to go with.

Right foot:
- ~12 heel-to-toe
- ~13.6 heel-to-ball
Taking the larger of the two, that's 13.6, and moving to the next-larger-size means using a 14, which sounds ridiculous to me.
Looking at the width for a size 13-14, a '14' is right in the middle of a width of 'A', while a '13' would have me directly between an 'A' and a 'B'.

Conclusion:
It looks like my left foot would want a 13B or A, and my right foot would want a 14A or a 13B or A.

Results from trying real shoes:
- 2015.05.21 - I ordered three pairs of the same style of shoe (Clark's Un.kenneth, SKU 7417648) in three different sizes: 13 B, 12 4E, and 12 EE. The 12E felt the most comfortable. All three pairs fit my toes nicely (a problem I've had with other pairs is that my pinky toe will be squished in), but the 13s didn't seem to have the ball of the shoe line up with the ball of my foot as nicely as the 12s did. I think the 13s also had the arch too far forward for my feet. With all three pairs there was pressure against the bottom and side of the instep of my left foot, which seems to have a lower arch than my right foot. The pressure was the least with the 12E, but still present enough that I think my left foot may end up hurting at the end of a full day of wearing the shoes. I don't think getting the shoes in an other size would help with this; it seems to be a fundamental difference between my arch and the arch that the shoe is designed to fit. Another issue is that the shoe isn't designed to accept custom inserts, which might have been able to alleviate the problem a little.