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Out of the holy trinity, as I call it (MB, JC and CL) MB runs the most true to size. I normally wear a 7.5 (37.5) and for MB I wear the same or an 8 depending on the model. For CL, I wear an 8 or 8.5 and there is no talking about JC, they just don't fit my feet.
June
Sedaraby fits everyone differently. I wear a half size smaller than my normal Blahnik pump size.
My friend could not get them to fit her feet, no matter what size she tried (her toes extended beyond the front of the shoe, or her foot slipped out of the shoe).
I'd recommend trying before you buy.