Answer:
1- Return to fashion trends of past decades. The fact that many of the movies and TV shows are set in the past makes many people begin to acquire a taste for the trends of those times, and try to acquire the outfits that were used in those times. One way of acquiring them is through the purchase of second hand, where the antiquity of the product is guaranteed and not a "remake" of it.
2- Increase in clothing costs of recognized brands. One way of acquiring branded clothing is through the purchase of second hand, where the previous use of the garment reduces its value and makes a first level product accessible to people with incomes not so high as to buy them first hand .
3- Loss of priority of clothing expenditure within the budget of the people. The fact that many people change their consumption habits causes them to stop allocating a large amount of their income to buy clothes, which means they are looking for more accessible alternatives to allocate a greater amount to other expenses.
It is not easy to predict whether this trend will continue or not, because today the trends of consumption and fashion tend to last very little, and are influenced by the mass media and social behavior at a general level.