When sourcing jeans, the fabric composition is paramount; look for a blend of 98% cotton and 2% elastane for comfort stretch, or 100% cotton for authentic vintage styles. Pay close attention to fabric weight, typically measured in ounces (oz)—10-12 oz is standard for year-round wear, while 13 oz and above is considered heavy-duty. Additionally, verify the denim construction (e.g., 3/1 right-hand twill) and ensure the use of high-quality hardware like YKK zippers and reinforced brass rivets to prevent premature failure.