When sourcing fabric by the meter, the most critical technical indicator is GSM (Grams per Square Meter), which determines the weight and thickness of the material. For apparel, a range of 150-200 GSM is standard for t-shirts, while upholstery requires 300+ GSM. Additionally, verify the Yarn Count (e.g., 30s, 40s); higher counts generally indicate a finer, smoother fabric. For functional fabrics, ensure you request test reports for Color Fastness (Grade 4 or above), Shrinkage Rate (controlled within ±3%), and Pilling Resistance to ensure long-term durability.