When evaluating wool fabric, the most critical factor is the Super Number (e.g., Super 100s to 180s), which indicates the fineness of the wool fibers; higher numbers offer a softer feel and more luxurious drape but may be less durable for daily wear. You must also check the fabric weight, typically measured in grams per linear meter (GSM)—lightweight (200-240g) is ideal for summer, while mid-weight (270-340g) is best for multi-season use. Additionally, verify the weaving method (e.g., Twill, Plain, or Birdseye) to ensure it meets the specific aesthetic and breathability requirements of your target market.