When sourcing high-end polo shirts and apparel, prioritize fabric composition, specifically 100% Petit Piqué cotton, which is the signature knit for this style. Ensure the GSM (Grams per Square Meter) is between 190-210 for a premium feel. Inspect the logo embroidery; authentic-quality replicas or inspired goods must have a clear, sharp definition with no loose threads. For B2B buyers, it is critical to request pre-production samples to verify colorfastness (Grade 4 or higher) and shrinkage rates (less than 3%) after industrial washing.