This is severely out of date now but there was a comment on the previous thread about the Popsy Facebook group and I just wanted to say: I'm an escapee of that place and it is. The. Dirt. Worst.
I don't think brands on their own can make you ill, and there's always some personal responsibility when it comes to only buying clothes you can afford, but that place absolutely preys on people with the "this is a safe and welcoming space for everyone no matter what your problems" shtick then pushes them to buy stuff they don't need. And so many people egging each other on to get into debt!
Also any kind of criticism no matter how valid (eg. I wore this dress once and it's bobbled to absolute duck) got deleted. And even if it did get left up for an hour or so, you'd get attacked by the rest of the group. So deeply, deeply WEIRD.
Plenty of Facebook groups like that I imagine but that's the only one I've ever been temporarily brainwashed by, so.
Sorry, just I've been holding onto that story for months and never seen anyone else talk about it.