When evaluating Cotton Voile, you must focus on the yarn count and thread density. High-quality voile typically features a yarn count of 60s, 80s, or even 100s, resulting in a lightweight, semi-sheer fabric. Ensure the GSM (Grams per Square Meter) falls between 50-90g/m² to maintain its characteristic breathability and soft drape. Additionally, verify the combing process; 'Combed Cotton' is essential to remove short fibers, ensuring a smooth surface and high tensile strength for garment manufacturing.