It’s a good article and there are some useful links at the bottom.
Quality has definitely gone downhill in recent years. It’s now quite rare to see anything in natural fibres or from a mid-market brand. On another note charity shops sometimes don’t help themselves. I took a blouse into my local one recently. It was M&S linen, great condition, in season, ironed and on a hanger. It was perfect and could have had a price label attached and been put on the rail. The volunteer thanked me, took the blouse, threw away the hanger and then crumpled the blouse into a sack! I then saw the blouse again in the shop two weeks later, no doubt having been freshly re-ironed by some volunteer…
Having been involved in a charity that had a volunteer-run shop all of the issues in the article were very apparent, however the volunteers were also a law unto themselves. Quite a lot of items never made it out on sale and went straight to rag or waste simply because the volunteers didn’t like them and ‘didn’t think they would sell’…But they were volunteers so, hey ho!
It’s not a perfect world and I am not sure that trying to shame donors is the best way forward, with the obvious exception of those who donate hazardous, unhygienic items or flytip stuff outside.