i went half size up. im usually a 37 but bought size 37.5 and they fit perfect.Hi. I am usually a 36.5 too, but I am not sure whether to take 36.5 or 37 for YSL tribute sandals. My foot length is 23.5cm and width is 9.5cm. Would really appreciate it if you can enlighten me on this, as I cannot go down to a YSL store to try out. Thanks!!