I wear shoes in size 8.5 or 9 and have a slightly narrow foot; in narrow shoes it's usually an 8.5, in regular width shoes it's usually a 9.
I have two pairs of the Okalas in size 8.5. The solid black pair measures 10 1/2 inches from the buckle to the largest hole, the black/white patterned shoe is 10 1/8 inches to the largest strap hole.
Both shoes fit the same lengthwise, but the patterned shoe is noticeably narrower. I posted about it here:
http://youlookfab.com/welookfa.....ferent-fit
and here: http://youlookfab.com/welookfa.....t-question
I kept the patterned pair and have worn them several times already. They did stretch a bit/mold to my foot in the toe box and have become super comfortable, even more so than the solid black pair. The toe box is roomy for a pointy toed shoe, but then again I have slightly narrow feet. I think SE shoes in general tend to run a bit narrow, as I own several other shoes by this brand and they fit my feet well.