The U.S. secondhand apparel market is projected to reach $78.8 billion by 2030, growing steadily and outpacing the broader retail clothing sector, while the global resale market could hit $393 billion. Growth is being driven largely by Gen Z and millennials, who are expected to account for over 70% of resale market expansion. Secondhand shopping is increasingly happening across multiple channels, including social media, in-person browsing, and AI-powered tools, with many consumers open to automated purchasing. The sector is becoming more competitive and complex as it takes market share from traditional retail and adapts to how younger consumers discover products. Rising costs and economic pressures are also pushing shoppers toward secondhand goods, with even major brands launching resale programs to meet demand.