Tried on various pairs today. I've been measured at 8D, and think either 7 or 7.5 would work for me with Desert Boots.
At first, Beeswax in 7 seemed on the tight side but walking around afterwards, they seemed fine - I assume they'd break in some as well? The Clarks store unfortunately was out of Beeswax in 7.5, so I tried on the Oakwood in 7.5 - a little extra room in the toe, but seemed fine otherwise. However, that's also a softer and less rigid material.
I'll probably roll with the Beeswax in 7, just because I like the color the best and I hope it'll soften up some. But damn, that Oakwood material was really comfortable.