it's trendy these days, because you can find original clothes and it's eco:
It was 'cool' to buy vintage clothes for years in Ireland and the UK - also army and navy surplus was a big thing. We all had combat jackets as we called them, and reefer jackets (sailors' jackets). Most of the combat jackets seemed to come from the Red Army!! Mine was from China - that was all they had in my size on the day :) Back in the 60s and 70s in London the very cool guys and girls wore sailors' trousers because the flares were super-wide - and the Mods bought original Edwardian shirts with detachable collars and gentlemen's hacking jackets.
Oh yes, and I'd forgotten, wearing your grandfather's old overcoat and maybe his hat was a thing with the guys in art college. I wore my grandad's old silk ties as belts.
not only because of low prices.
Actually some people in Poland deliberately scour the secondhand shops for designer label stuff at rock bottom prices and then sell it online at a profit.