When sourcing fashion garments, the fabric is the foundation of value. You must verify the GSM (Grams per Square Meter) to ensure the weight matches your seasonal requirements. For high-end apparel, prioritize long-staple cotton or synthetic blends with anti-pilling treatments. Always request colorfastness reports (Grade 4 or higher) to prevent bleeding during washing. If sourcing functional fashion, ensure the supplier provides certifications for moisture-wicking, UV protection, or water resistance.