For tight jeans (skinny fit), the fabric composition is critical. You should prioritize a blend of 95-98% Cotton and 2-5% Spandex (Elastane) to ensure the denim has sufficient 'stretch and recovery' properties. High-quality tight jeans must pass a stretch recovery test; the fabric should return to its original shape after being pulled, preventing 'baggy knees' after wear. Additionally, verify the fabric weight, typically measured in ounces (oz); 9oz to 12oz is ideal for year-round tight jeans, providing a balance between durability and comfort.