Non-profit organizations may take donated items, like t-shirts, and give them away (or sell them to wholesalers, who then mark up the price by 300-400 percent) in poor areas of the global south.
For example, at a championship sports games, shirts are printed for both sides to celebrate their championship win. One team loses, however, and those shirts are donated to a charity, mission, or non-profit organization.
Somewhere there is someone with a warehouse full of MAGA gear. If we move on to a new president in November, that means there will be a zillion hats and t-shirts with no US market. That apparel will likely/possibly end up in developing countries.
Which means that a half dozen years from now documentarians working in Liberia or rural Mali or Central African Republic will be shooting video of people wearing MAGA gear.
The future is weird.