When sourcing matching sets, prioritize high-grade PU leather, genuine leather, or luxury fabrics like satin and lace. For the shoes, ensure the insole is made of breathable, high-elasticity foam for comfort, and the outsole is slip-resistant rubber or TPU. For bags, check that the lining is durable polyester or silk and that all hardware (zippers, buckles, chains) is electroplated to prevent rusting and fading. Craftsmanship should be verified by checking for symmetrical patterns, consistent stitching (at least 8 stitches per inch), and secure glue bonding without visible residue.