When sourcing luxury footwear, prioritize Full-Grain Leather or Top-Grain Leather for uppers, as these offer the highest durability and natural breathability. For the construction method, Goodyear Welt or Blake Stitching are industry benchmarks for high-end shoes, allowing for easy resoling and longevity. Ensure that the lining is made of genuine calfskin to prevent moisture buildup and enhance wearer comfort. Inspect the stitching density, which should be consistent and high (typically 8-10 stitches per inch) with no frayed threads.