I'm a 5.5 and i got a size 6 which fitted perfectly. I think a whole size up for me might have been a little big as they are suede and will stretch. But any of you half sizes up there, get the nearest size up.
Jane Emms -
These were too tight for me, so i returned them and swapped them for the next size up. Free returns for me, but id suggest warning others that they may need to size up.