When evaluating Lurex (metallic yarn) fabrics, you must prioritize yarn composition and density. Ensure the base fabric (e.g., polyester, nylon, or silk) is clearly defined alongside the percentage of metallic fiber, which typically ranges from 3% to 15%. Pay close attention to the GSM (Grams per Square Meter) to ensure the fabric weight matches your application, whether it is for lightweight evening wear or heavier upholstery. Additionally, verify the width of the fabric (usually 150cm/58") to optimize your cutting markers and reduce waste.