When sourcing from a suiting fabric factory, you must prioritize fiber composition, fabric weight (GSM), and yarn count. For premium suiting, look for Super 100s to Super 150s wool counts or high-quality TR (Tetoron Rayon) blends that offer durability and wrinkle resistance. Ensure the factory provides a GSM (Grams per Square Meter) range suitable for your target season: 240-280 GSM for all-season wear and 300+ GSM for winter collections. Additionally, verify the colorfastness rating (Grade 4 or higher) and pilling resistance to ensure long-term garment quality.