When evaluating trousers, focus on fabric composition (e.g., cotton/polyester/spandex blends), fabric weight (GSM), and construction quality. For professional or workwear trousers, ensure a fabric weight of 240-300 GSM for durability. For stretch trousers, a 3-5% Spandex (Elastane) content is essential for shape retention. Pay close attention to seam strength (double-needle stitching) and the quality of hardware like YKK zippers or reinforced buttons, which significantly impact the product's lifespan and perceived value.