Mens thrift shops are always a gamble. Do you know the website vinted.com? It's an enormous second hand store. You buy directly from the previous owner. The company is from Lithuania if that matters to you.

As for clothing stores, we need more information. What kind of clothing do you look for and maybe also where exactly do you live. I wear mostly local German brands so that might be no option.

Nudie Jeans is Swedish and makes good quality jeans with free repairs.

!buyeuropean@feddit.uk used to have a few threads that could help you

Vinted is great

If you are in Belgium: Jules makes some damn good sweaters and pants, even for my brother in law who is very tall and thin and finds it very difficult to find clothes that fit well.

Thrift shops have always been bad for me. When I had an athletic build to now when I am a bit athletic but also fatter, thrift shops in Belgium exclusively have 170cm, 50kg men clothes and 190cm, 150kg clothes with rarely an in between.

https://momox.de based in Leipzig, delivers used clothes in Germany.

Varusteleka.com

WE, Bayard co. Ltd