Do these run true to size, 1/2 size small, 1/2 size big, etc.??
Blackbird - I am not sure about this specific style because I have never tried them on. But in general CL shoes run small, so I would recommend getting at least 1/2 size larger than you normally wear.
I would get a 38.5 by default, but they aren't available in that size right now from Barneys. I know some of the CL shoes run big though, and others (like the Raffia Yoyo Slingbacks I just ordered from NM! and Pigalles) run true to size surprisingly enough.
Barneys has a great price on these at $150, if you can find it in your size.