My foot measures out to a size 10C using the measuring device found in most shoe stores. Â I wear a size 10M in To Boot New York, a size 9.5D or 10.5D in Bally and a size 9.5D in the RL/EG Cardiffs. Â What size would fit me better in the Grenson masterpieces being sold by Bennie's: size 9.5D or size 10D? I'm hoping it's the former because the selection in 9.5D is a whole lot better . . .