When evaluating pants for bulk purchase, focus on fabric composition and weight (GSM). For denim, look for 12-14 oz weight for durability; for activewear, ensure a polyester-spandex blend with at least 15% spandex for elasticity. Pay close attention to seam construction, specifically double-needle stitching or flatlock seams in high-stress areas to prevent tearing. Additionally, verify the colorfastness rating (Grade 4 or higher) to ensure the product maintains its appearance after multiple washes.