Counterfeit apparel continues to challenge luxury fashion houses, department stores, and resale platforms. NFC authentication gives each garment a secure digital identity that can be read at every stage—from care label integration during production to in-store verification and secondhand resale. In this guide for fashion and apparel professionals, we explain what a garment authenticity tag is, which washable NFC and RFID tag options work, how care label integration protects design, and how NFC improves apparel resale trust while supporting digital product passport initiatives. Protecting a luxury garment from counterfeit to resale is no longer optional.