When sourcing Aaa shirts, the fabric composition is the most critical factor for quality. For premium markets, prioritize 100% Long-Staple Cotton or Pima Cotton for superior softness and durability. For performance or athletic shirts, look for moisture-wicking polyester blends with at least 5% Spandex to ensure elasticity. Always verify the GSM (Grams per Square Meter); a weight of 180-220 GSM is ideal for high-quality, non-see-through t-shirts, while 120-150 GSM is suitable for lightweight summer wear.