I bought a nice sweater from the ESA merch store and now I'm looking for more euro-centric apparel. Give me your recommendations, it can be from any EU country and doesn't have to be state sponsored, but it should be official, no bootlegging. I'm really open to a wide variety of suggestions. European companies, institutions, even will known brands, if it's clearly European I'm interested.

The official ESA store: https://shop.esa.int/

Used to follow the account behind this a few years back, never bought anything though: https://www.redbubble.com/de/people/DGMEME/shop

https://eu-parliamentshop.eu/

I think this is one the only official EU parliament merch shop.
Everything else is a fan/third party shop.

That's neat! Doesn't get more EU than this.

Your welcome 🇪🇺

https://szmer.info/post/11565760

The first truly European brand: https://shop.eurovision.com/

PS: UEFA might disagree, but their shop is poorer https://www.shopuefa.com/

PPS: brands like Air Europa or EuroSport could be interesting alternatives, but they don't seem strong on selling own merch.

I went digging myself and found the Airbus shop: https://airbus-shop.com/en/

... and another one https://www.thestore-dassault-aviation.com/en/

The clothes look pretty nice, as expected from a French store.