You're not the only one. Try pairing that with a size 11 shoe.
Finding boots for myself (and shoes in general) is a total headache, I usually end up wearing whatever shoes/tall boots/paddock boots I do find in my size until the soles fall off, just to keep away from the headache!!
I ended up with a pair of field boots (I know you're looking for dress) from Devon-Aire. They're not the best quality, I certainly wouldn't wear them for more than special occasions such as lessons with trainers other than my person one, and shows, but they were hard to pass up at $36.
RH Queen O Anywhere "Sydney"
2009 Sugarbush draft