AbstractThis paper will discuss the dynamics of second-hand markets in Puebla-Tlaxcala, Mexico, from the 'tianguis' to eCommerce on Instagram. Our work will analyse the increasing use of second-hand clothes in Mexico from a sociological and anthropological perspective. 'Ropa de paca' are second-hand clothes that arrive illegally to Mexico from the United States and are distributed around the country to be sold in markets known as 'tianguis'. These markets have been around for centuries and are located in marginal and peripheral areas in Mexican cities. This paper aims to discuss the dynamics inside the markets and commercialisation through social media. Finally, we will problematise the current issue surrounding the second-hand market, which is currently going through gentrification. In the last years, and with the increasing trend of second-hand clothes, people from upper economic backgrounds have been more interested in buying them and reselling them online for lucrative means and under the excuse of sustainability. We acknowledge that the current dynamics are essential, but they are also greenwashing the market. The use of second-hand clothes is an essential alternative to the current fast fashion system, but gentrification in the Global South and its implications must be discussed.