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Other than looking for specific brands at TKMaxx (last few years' purchases have been Carhartt, Dickies, Edwin, Folk, Common People), ebay often has plenty of hardly worn stuff from nicer brands. Suppose those I've listed aren't that far removed from fast-fashion, if at all - but at least at a personal level I'll wear fewer things for longer.
For the usual suspects (for me, anyway!) - Albam, Universal Works, Engineered Garments et al. - if you find actual auctions as opposed to buy-it-now you can get really good deals on stuff.
I just caught up on the last two years of this thread and man's not wrong about this:
Some of the prices of the stuff posted/boast posts are pretty obscene.
I need to buy some new clothes though and I can't afford any of the shit posted in here so obviously I'm evil too, because my budget means I'm going to find it hard to avoid fast fashion.