Shimokitazawa - a neighbourhood in Tokyo - has SO many secondhand stores it’s overwhelmingly good.
a.k.a.C.a.k.a vintage
Rag Tag - loads of designer pieces and they’re all over the place!
Auld Lang Sun
New York Joe Exchange
Kindal - lots of these around Japan too and they’re all worth a squiz (I still regret not buying a gorgeous Gucci jacket I found)
Bazz Store
Chicago