Authentic Aran sweaters must be evaluated based on fiber composition and stitch complexity. Prioritize suppliers using 100% Merino wool or British wool for high-end markets, as these provide superior warmth and breathability. Ensure the traditional patterns (such as Honeycomb, Cable, and Diamond) are clearly defined and consistent. For B2B buyers, it is crucial to distinguish between hand-knit, hand-loomed, and machine-knit varieties; hand-knit items command a premium price but have longer lead times, while machine-knit versions offer scalability and cost-efficiency for mass retail.