I bought a pair of YSL tribtoo pumps, the taller 'caviar leather' version, in Europe so I can't exchange them anywhere. I bought them in a 36 and normally wear a US size 6.5. I keep reading that they run large, however I find that while the length is fine, the toebox is fairly tight so that my toes almost curl into each other! My question--is this normal for brand new tributes? Will they stretch and how tight are they supposed to be? I can barely wear them for more than a couple hours. Should I sell them and buy a larger size?