When sourcing custom suits, the fabric composition is the most critical factor. Prioritize 100% Merino Wool or high-end wool blends (Silk/Cashmere) for premium lines. Pay close attention to the Super Number (e.g., Super 110s to 150s); higher numbers indicate finer fibers but may be more prone to wrinkling. For durability in corporate uniforms, a Wool/Polyester blend (70/30) is often more economically feasible. Ensure the supplier provides fabric weight specifications (GSM), typically ranging from 240g-280g for all-season wear.