They have some ballet flats that I want.. I'm 9.5 in Tory Burch flats and usually a 40 in shoes/boots but I usually size up to 40.5 for high end shoes like MJ/Miu Miu/Lanvin ect. I was wondering would size 10/40 in the GZ flats fit me??? I won't be able to return them if they don't fit..so I need to be sure before ordering. TIA!