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There was a thread earlier about people wanting to show support but that the t-shirt designs from the EU parliament store aren't subtle enough
The channel Eurosport also has some items on Vinted. Their designs are tasteful in the sense that it's e.g. blue stars on a dark blue background
Average BuyFromEU poster when the etymology of one word you used in your post points to the United States of America:
It's an old merch brand found on used clothing sites that just happens to have a design people may be looking for. I'm sorry that it's not 100% ideologically accurate comrade :(