Buyers must prioritize Fabric Weight (GSM) and Yarn Count to ensure the material meets the intended use. For instance, a GSM of 180-220 is ideal for premium T-shirts, while higher weights are needed for hoodies. Additionally, verify the Fiber Composition (e.g., 100% Combed Cotton, Cotton-Spandex blends, or Recycled Polyester) to ensure the desired elasticity, breathability, and hand-feel. Always request a pilling resistance test report (Grade 3-4 minimum) to guarantee long-term garment durability.