Debating Between Sizes For This Pair of Runway Shoes!!!

  1. Hi everyone, I just bought a pair of this YSL runway 2012 moccasin pumps and was wondering if any of you know how the sizing runs for this particular style. I know it's small to size but I'm not sure by how much (half a size? a whole size?)

    I am debating between two sizes, 36.5 and a 37 (I am usually a US 6 - 6.5, but 6 is more like my true true size). Any suggestion would help! Thanks in advance!!!