When sourcing suit fabrics, the Super Number (e.g., Super 100s to 180s) is a critical indicator of fiber fineness; higher numbers signify a softer, more luxurious feel, but may be less durable for daily wear. You should prioritize fabrics with a weight of 240g-280g/m for four-season versatility. Additionally, check the composition ratio: while 100% wool is premium, a blend with 5-10% silk or cashmere enhances sheen, and 2% elastane (Lycra) provides essential comfort stretch for modern slim-fit designs.