When evaluating cotton cashmere fabric, the blend ratio is the most critical factor; a common high-quality ratio is 90% cotton and 10% cashmere or 85/15, which balances the breathability of cotton with the luxury of cashmere. You must verify the yarn count (e.g., 2/48Nm or 2/60Nm), as higher counts indicate a finer, smoother fabric. Additionally, check the fabric weight (GSM) to ensure it matches your intended use, such as 150-200 GSM for lightweight knitwear or 300+ GSM for heavier hoodies or blankets.