- 24Ss new SAINT LAUREN*CASSANDRA YSL diamond buckle flip-up flat sandals. These flat sandals are equipped with T-shaped arch straps and adjustable buckles, and are embellished with metal rhinestone buckles on the front! Upper: silk satin, lining: lambskin, sole: Italian genuine leather sole, size: 35-39 (40, 41 customized, non-refundable),